297 results found.
... Science Frontiers ONLINE No. 113: Sep-Oct 1997 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects An exploded planet and the "face on mars"Between Mars and Jupiter swirls the main main asteroid belt. In the view of many astronomers, including T. Van Flandern, there resides the debris of an exploded planet. Van Flandern has adduced considerable evidence supporting the exploded planet hypothesis, which we will pass over in favor of a look at the possible effects of said exploding planet upon a large but equally hypothetical satellite of said planet. Such a satellite would have been heavily pelted by debris on the side facing the exploding planet. Furthermore, this battered sphere, having lost its gravitational "anchor," would assume a new orbit around the sun as well as a new orientation in space. Is there any object in the solar system plastered mainly on one side with debris and craters? You guessed it: Mars! What possible connection could there be between this purported cataclysm and the "face on Mars"? The connecting thread is very weak but so beguiling that we must mention it. T. Van Flandern has proposed eight tests for the artificiality of the "face" and its associated "pyramids," "city," etc. One is the three-dimensionality of the "face." Another is the "fractal" test, which is useful in distinguishing between artificiality and naturalness. The "face" readily passes four of the eight tests. A fifth test (bilateral symmetry) cannot be decided ...
Terms matched: 1 - Score: 269 - 15 May 2017 - URL: /sf113/sf113p03.htm
... Science Frontiers ONLINE No. 77: Sep-Oct 1991 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Mercury: the impossible planet Mercury, largely hidden in the sun's glare, also conceals beneath its baked, cratered surface: (1 ) far more iron than solar-system theory allows; and (perhaps) (2 ) a dynamo that should not exist. Let us take the excess-iron problem first. Mercury's density is 5.44 (compared to earth's 5.52), so that it very likely contains much iron. Our moon, which resembles Mercury in size and external appearance, only has a density of 3.34, implying an altogether different origin. In the currently accepted theory of solar-system formation, all of the planets and their satellites condensed from a primordial disk of dust sur rounding the just-formed sun. The planets closer to the solar inferno lost more of their easily vaporized constituents due to the sun's heat. The cooler, outer planets were able to retain large amounts of ices. In this scenario, we would expect Mercury to be rich in iron and rocks. This seems to be the case, but it has too iron to fit the theory. Astronomers have tried to save the theory by supposing that a large asteroid sideswiped Mercury tearing off part of its outer layer of lighter rocks, leaving the heavier iron core untouched. The theory doesn't say what happened to the debris from this colossal collision. As for Mercury ...
Terms matched: 1 - Score: 204 - 15 May 2017 - URL: /sf077/sf077a03.htm
... Science Frontiers ONLINE No. 134: MAR-APR 2001 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Missing Planets In Globular Clusters If you lived on a planet circling a star in a globular cluster, you would see a night sky ablaze with thousands of stars all brighter than the brightest in the earth's sky. This is because globular clusters contain tens of thousands of stars all compressed into 5-25 parsecs -- they are much more tightly packed than those in the Milky Way in general. In fact, though, you would have to observe this blazing sky from a spaceship, because diligent searches have not detected any planets in any of the many globular clusters. In 1999, a team of 24 astronomers used the Hubble Space Telescope to search for planets in the cluster named 47 Tucanae. Their method was to look for dark planets crossing the bright disks of the cluster's stars. After patiently watching 34,000 stars, they came up empty-handed. For some unknown reason, planets never formed around the stars in 47 Tucanae -- or in any other globular clusters checked so far. Are globular clusters in general different from the rest of the Milky Way? Possibly, see below. (Anonymous; "No Globular Planets?" Astronomy, 28:34, October 2000. Anonymous; "Planets Come Up Missing in a Globular Cluster," Sky & Telescope, 104:23, October 2000.) Answer. Globular clusters are peculiar in several additional ways. For example, the ...
Terms matched: 1 - Score: 200 - 15 May 2017 - URL: /sf134/sf134p04.htm
... Science Frontiers ONLINE No. 136: JUL-AUG 2001 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects 2000 CR105 and Planet X 2000 CR105 is a supercomet some 400 kilometers in diameter. It is one of hundreds of icy TNOs (Trans-Neptunian Objects) that normally populate the Kuiper Belt girdling the solar system just beyond the orbit of Neptune. The problem is that 2000 CR105 is not normal. Its orbit is highly eccentric, with an aphelion 13 times farther out than Neptune's . This massive object (probably mostly ice) takes 3175 years to circle the sun. 2000 CR105 is real; it has been photographed; it is not Mirror Matter; no one blames any terrestrial extinctions on it. Nevertheless, we can and must wonder how its orbit became so badly distorted. Often in past years, whenever astronomers detected cometary orbits gone awry, they invoked Planet X; that is, some undiscovered massive body plying the outer reaches of the solar system. Indeed, there have been several intense and unsuccessful searches for Planet X over the years. (See Chapter AX in The Sun and Solar System Debris.) History seems to be repeating itself with 2000 CR105. Astronomer B. Gladman proposes that 2000 CR105 was forced into its present eccentric orbit by an encounter with a Mars-size Planet X that now orbits the sun at a distance about 15 times that of Neptune. From the standpoint of celestial mechanics, this perturbation of 2000 CR105's orbit is certainly within the realm of possibility. But two associated ...
Terms matched: 1 - Score: 200 - 15 May 2017 - URL: /sf136/sf136p04.htm
... Science Frontiers ONLINE No. 113: Sep-Oct 1997 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A VANISHED PLANET?Almost every week, it seems, a new Texas-sized object is discovered in the outer solar system. In the inner solar system, however, some astronomers are finding "holes" where planets seem to have been ejected by unknown forces. D. Christodoulou, Louisiana State University, found one such "hole" serendipitously. He was studying how the sun and the planets might have condensed from the (hypothesized) cloud of primordial gas and dust. Factoring in gravity, rotation, and magnetic fields, he found the cloud condensing in concentric rings at just the right locations for protoMercury, proto-Venus, and proto-earth. The fourth ring, however, did not correspond to any existing planet, and the position of proto-Mars was off the mark. But the asteroids and outer planets fell rather neatly into place. The implication of these calculations is that some turmoil in the early inner solar system cast out one planet and dislocated Mars. (Hecht, Jeff; "Did Extra Planet Vanish into Outer Space?" New Scientist, p. 18, June 14, 1997.) Comment. These are sour notes in the "music of the spheres," but don't be overly concerned; these are just calculations based upon many assumptions. Calculated positions of rings of condensed dust and gas compared to actual planet locations. From Science Frontiers #113, SEP-OCT ...
Terms matched: 1 - Score: 162 - 15 May 2017 - URL: /sf113/sf113p02.htm
... Science Frontiers ONLINE No. 87: May-Jun 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The earth: a doubly charmed planet In SF#85, we learned that the evolution of advanced life forms on earth may have depended upon the protective influences of Jupiter and Saturn. These two giant planets can gravitationally deflect potentially devastating asteroids and comets away from the earth. It seems now that we are doubly lucky! Computer runs demonstrate that the presence of our large moon has stabilized the earth's spin axis down the eons. Presently, the earth's spin axis makes an angle of 23.5 with the plane of the earth's orbit (its "obliquity"). The well-known result is our yearly procession of seasons. Without the steadying effect of the moon, however, the earth's obliquity would probably have swung chaotically over much larger values. Such extreme changes would have been inimical to the development of life, particularly advanced life. As a case in point, the polar axis of Mars, with only two tiny moons to dampen its spin excursions, seems to have gone through many wild swings, as indicated in the figure. What deadly climatic changes must have wracked our sister planet! (Touma, Jihad, and Wisdom, Jack; "The Chaotic Obliquity of Mars," Science, 259: 1294, 1993. Also: Laskar, J., and Robutel, P.; "The Chaotic Obliquity of the Planets," Nature, 361:608, ...
Terms matched: 1 - Score: 125 - 15 May 2017 - URL: /sf087/sf087a04.htm
... Science Frontiers ONLINE No. 43: Jan-Feb 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Planets As Fragments Of An Ancient Companion Of The Sun J. Webb has called attention to a fascinating feature of the solar system. "If one calculates the total energy and the total angular momentum of the planets, the numbers turn out to be very nearly the same as those of a single planet having a mass essentially the same as the total mass of all the planets, and orbiting the sun in an orbit which is near the present-day center of mass of all the planets. The possibility that the solar system was once a binary star (or is in the process of becoming one) needs to be examined more closely." (Webb, Jerry; "The Solar System and a Binary Star: Is There a Connection?" American Journal of Physics, 53:938, 1985.) Cross reference. See SF#42 for speculations about the solar system once being a quintuple star system. From Science Frontiers #43, JAN-FEB 1986 . 1986-2000 William R. Corliss ...
Terms matched: 1 - Score: 118 - 15 May 2017 - URL: /sf043/sf043p06.htm
... Science Frontiers ONLINE No. 133: JAN-FEB 2001 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Invisible Suns And Maybe See-through Planets, Too Astronomers have been baffled lately by the discovery of planets wandering aimlessly through outer space apparently without the guidance of a central sun. (Ref. 1) Planets, you see, are supposed to have been formed in the discs of dense dust orbiting newly created stars. They have no business wandering through the void unattended. No problem, says R. Frost of the University of Melbourne, "They could be in orbit around Invisible Stars! (Ref. 2) If we can have Missing Matter, we suppose that Invisible Stars are not as ridiculous as they sound. It is postulated that Invisible Stars are composed of Mirror Matter, a new construct of astronomers who are desperately trying to explain their burgeoning files of celestial anomalies. Mirror Matter is strange "stuff." It interacts with Ordinary Matter only through gravity, it doesn't emit light. It is palpable but invisible. (This sounds weird, but no weirder than quantum mechanics!) Foot also pointed out that stars composed of Ordinary Matter may be orbited by Mirror-Matter planets. Expanding along these lines, whole star systems could be 100% Mirror Matter, and we'd never see them at all. How about Mirror-Matter asteroids and meteors zipping around our solar system -- invisible but palpable and threatening? As a matter of fact, it has been speculated that the still- ...
Terms matched: 1 - Score: 104 - 15 May 2017 - URL: /sf133/sf133p03.htm
... already in print are given alphanumerical labels. For example, BHB1 = B (Biology)+ H (Humans)+ B (Behavior)+ 1 (first anomaly in Chapter BHB). Some anomalies and curiosities that are listed below have not yet been cataloged and published in catalog format. These do not have the alphanumerical labels. AA ASTEROIDS AAB CELESTIAL MECHANICS PROBLEMS WITH ASTEROIDS AAB1 Anomalous Asteroid Orbits AAB2 Asteroid Distribution Anomalies AAB3 The High "Internal Energy" of the Asteroid Population AAB4 Peculiar Distribution of Asteroid Spin Rates AAB5 Unexplained Residual Precession of Icarus AAB6 Evidence against an Explosive Origin for Asteroids AB SOLAR SYSTEM "LAWS" AND INTERRELATIONSHIPS ABB DYNAMICS OF THE SOLAR SYSTEM AS-A -WHOLE ABB1 Solar-System Instability ABB2 Circularity of Planetary Orbits ABB3 Anomalous Split of Angular Momentum between Sun and Planets ABB4 Ubiquity of Resonances in the Solar System ABS REMARKABLE RELATIONSHIPS AMONG PLANETARY AND SATELLITE PARAMETERS ABS1 Solar System Laws of Distance ABS2 Similarity of Densities of Composite Terrestrial Planets ABS3 Multiple Primaries in the Solar System ABS4 Supposed Quantization of Planetary Orbital Periods ABS5 Solar System Mass Laws ABS6 The Quantized Nature of Orbital Systems AC COMETS ACB ORBITAL ANOMALIES OF COMETS ACB1 The Appearance of Comets in Cycles ACB2 Nonrandom Direction-of-Approach of Comets to the Sun ACB3 New Comets Have Almost Critical Velocity ACB4 Sun-Grazing Comets: The Kreutz Group ACB5 Changing Cometary Periods ACB6 Jupiter's Family of Comets ACB7 Low-Eccentricity Cometary Orbits ACB8 The Scarcity of Hyperbolic Orbits ACB9 Cometary Groups ACB10 Orbits of New Comets Diverge from Common Point ACB11 Excess of Retrograde Long Period Comets ACB12 Uranus-Neptune Region Favored as Comet Source ...
Terms matched: 1 - Score: 98 - 15 May 2017 - URL: /cat-astr.htm
... Science Frontiers ONLINE No. 63: May-Jun 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Planets Are Unpredictable It was only about 40 years ago when astronomers, aghast at Velikovsky's vision of worlds in collision, stated very firmly that the solar system was presently stable and had been so for eons. Now it seems that they may have been a bit hasty and all-encompassing. Not that the Velikovsky scenario is correct or that Mars might at any moment depart from its present orbit, but rather that astronomers must now admit an inability to predict planetary motion over billions of years - even tens of millions of years! For the solar system, if those ubiquitous computers are correct, is not a well-behaved family of planets. J. Laskar concludes from extensive numerical experiments: "The motion of the Solar System is thus shown to be chaotic, not quasiperiodic. In particular, predictability of the orbits of the inner planets, including the Earth, is lost with a few tens of millions of years." (Laskar, J.; "A Numerical Experiment on the Chaotic Behavior of the Solar System," Nature, 338:237, 1989.) Comment. Laskar's comments are directed toward the future, but the same conclusions should apply if we ran the solar system backwards in time. From this very narrow perspective of celestial mechanics, one cannot say positively that the planets, the inner ones especially, could not have radically altered their orbits within the past few millions of ...
Terms matched: 1 - Score: 97 - 15 May 2017 - URL: /sf063/sf063a05.htm
... Science Frontiers ONLINE No. 42: Nov-Dec 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A Different Way Of Looking At The Solar System The current scientific consensus has the sun and its planets forming during the same process of accretion/condensation. In this view, the inner terrestrial planets differ from the outer giant planets only because their volatile elements were driven off by the sun's heat. This scenario has many problems, as recorded in our catalog volume The Moon and the Planets. G.H .A . Cole thinks that astronomers might have more success in explaining the origin of the solar system if they considered it a system of five large bodies of star stuff (light elements), each surrounded by its own retinue of high density satellites (the sun's four satellites would be the inner planets). In effect, then, we would have a quintuple star system in which only one member (the sun) collected enough star stuff to make it to incandescence. The four, large, outer planets would be merely failed stars. The advantages of this change of perspective are threefold: (1 ) All five central bodies are now compositionally similar as a class, (2 ) In each of the five systems, the angular momentum of the central body is greater than that of its satellites, whereas in the unitary solar system the angular momentum of the nine planets is much greater than that of the sun -- an embarrassing anomaly. (3 ) A final "bonus" appears when ...
Terms matched: 1 - Score: 92 - 15 May 2017 - URL: /sf042/sf042p08.htm
... Science Frontiers ONLINE No. 9: Winter 1979 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects An Ancient Planet Beneath A Youthful Veneer Gerald Wesserburg and Donald de Paolo, two California geologists, have studied the isotopic ratios of neodymium 143 and 144 in both continental and deep-sea lavas. If the underground lava sources were the same, the isotope ratios should be the same. But they are not. Midocean lavas are enriched in neodymium143 compared to continental lavas. Since neodymium-143 is a decay product of samarium, scientists have been able to establish the neodymium isotope ratio from the time of the Big Bang to the present. The isotope ratio for the mid-ocean lavas is just what would be expected on a planet where lighter surface materials had come to the surface during a molten state. The continental lavas, though, must tap very ancient reservoirs, possibly those of a true primitive earth. This ancient core is now swathed with younger materials from who knows where! This young envelope wraps around the whole planet, with the present continents being caused by slight protuberances on the ancient core. Whence the young veneer? A rain of material from some recent close encounter? (Anonymous; "Underground Sites of Ancient Earth," New Scientist, 83:886, 1979.) From Science Frontiers #9 , Winter 1979 . 1979-2000 William R. Corliss ...
Terms matched: 1 - Score: 89 - 15 May 2017 - URL: /sf009/sf009p10.htm
... Science Frontiers ONLINE No. 19: Jan-Feb 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Problems At The Rim Of The Solar System Neptune is an undisciplined member of the solar system. No one has been able to predict its future course accurately. Already this maverick planet is drifting off the orbit predicted just 10 years ago using the best data and solar-system models. All of the outer planets, in fact, confound predictions to some degree. In addition, some long-period comets have anomalous orbits. Astronomers have been aware that something was wrong for decades and anticipated finding a trans-Neptunian planet large enough to perturb the outer solar system. The discovery of Pluto did not help matters; it is much too small. The most popular explanation of the orbital anomalies relies on a large, still-undetected planet, possibly 3-5 times the mass of the earth, swinging sround the sun at some 80-100 Astronomical Units. But many have searched and no one has found anything. Planet-X , as it is often called, is just another bit of "missing mass." Thomas C. Van Flandern and Robert Harrington propose that all the obvious orbital damage in the outer solar system is the result of a single encounter between Neptune and another body, call it Planet X if you wish, that was passing through the outer reaches of the solar system. (Frazier, Kendrick; "A Planet beyond Pluto," Mosaic, 12:27, September/October 1981. ...
Terms matched: 1 - Score: 89 - 15 May 2017 - URL: /sf019/sf019p04.htm
... Science Frontiers ONLINE No. 85: Jan-Feb 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Why Intelligent Life Needs Giant Planets The two giant planets, Jupiter and Saturn, are 318 and 95 times more massive than the earth, respectively. Being so weighty they strongly perturb the orbits of comets, deflecting many away from the inner solar system, where we reside. Calculations by G. Wetherill, at the Carnegie Institution, reveal that if Jupiter and Saturn were only 15 times the mass of the earth, the earth would have been devastated every 100,000 years by giant comets, instead of about every 100,000,000 years, as indicated by the geological record. Under such intense bombardment, it would probably have been difficult for advanced life forms to develop. (Croswell, Ken; "Why Intelligent Life Needs Giant Planets," New Scientist, p. 18, October 24, 1992.) Comment. Reasonable as the foregoing assertion sounds, we do not really know what stimulates the development of new life forms. Actually, the fossil record reveals that some biological "radiations" occurred soon after great geological upheavals. That the Jupiter-Saturn "shield" was and is not completely effective is indicated by the heavy debris traffic mentioned above. From Science Frontiers #85, JAN-FEB 1993 . 1993-2000 William R. Corliss ...
Terms matched: 1 - Score: 89 - 15 May 2017 - URL: /sf085/sf085a04.htm
... Science Frontiers ONLINE No. 79: Jan-Feb 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Mercury's polar caps and icy minicomets Mercury, closest planet to the sun, should be baked bone dry, seeing that equatorial temperatures reach 800 F. When Mariner 10 flew past Mercury in 1974, its camera eye reinforced the baked-cinder model. To everyone's surprise, recent radar images obtained with powerful earth-based antennas, revealed a highly reflective patch at Mercury's north pole. Could it be ice, for ice reflects radar waves well? Quite possibly, for when Mercury's polar temperatures are calculated, away from the sun's direct glare, they plunge to -235 F. This means that some of the water vapor in the planet's thin atmosphere might freeze out in the poles, creating ice or frost caps. Wouldn't Mariner 10 have seen such a remarkable deposit? Not necessarily, for the spacecraft viewed only half the planet and, if the 640 x 300-kilometer ice patch were covered with dust, it could have been invisible to the camera. But it would still be a bright patch on terrestrial radar scopes, because radars see through thin dust layers. So, polar ice is not physically impossible on Mercury, although it is defi nitely surprising so close to the sun. All that is needed is a little water in the planet's atmosphere. Mainstream thinking is that "passing comets and asteroids" might bequeath Mercury some of their H2O ...
Terms matched: 1 - Score: 84 - 15 May 2017 - URL: /sf079/sf079a03.htm
... Science Frontiers ONLINE No. 139: Jan-Feb 2002 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects White Mars?Earth is called the "blue planet" by virtue of its thin veneer of blue ocean water. Mars is now red because of its endless vistas of reddish soil and rocks, But most planetary scientists now insist that Mars was once blue, too. It was drained by gushing rivers and supported a vast ocean. The planet's many channels and layered deposits seem to prove Mars was, like Earth, once a water-rich planet. We like to think this way because we so much want to find life on our sister planet, and to us water is life! Not so fast! says N. Hoffman from La Trobe University in Victoria, Australia. According to his hypothesis, water has had little or no importance in shaping the Martian landscape. Instead, his 'White Mars' model contends that the gurgling, frothing and sometimes explosive venting of carbon dioxide gas from beneath the surface created the features. Outrageous as Hoffman's hypothesis is, it is supported by several significant observations that seem to deny a watery Mars. The Mars Global Surveyor has not detected any carbonate minerals that should have been created when water interacted chemically with the planet's CO2 atmosphere. Surface photos fail to show the fine networks of tributaries that should have fed the larger drainage features if water were the agent of erosion. There is no evidence of large lakes or reservoirs at the heads of the so- ...
Terms matched: 1 - Score: 82 - 15 May 2017 - URL: /sf139/sf139p03.htm
... Science Frontiers ONLINE No. 89: Sep-Oct 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Blasting Rocks Off Planets "Can rocks from the surface of a major planet or satellite be launched into interplanetary space by natural processes? A few years ago the answer to this question would have been a resounding "no" from the experts on both volcanism and impact cratering, the only geological processes known to eject solid material at substantial velocities. Observation, however, has once again confounded expectation." In the snowy wastes of Antarctica, scientists have picked up meteorites that almost certainly came from the moon and Mars. And near St. Gallen, Switzerland, there was discovered a 22-centimeter block of Malm limestone that was apparently ejected from the Ries impact crater, almost 200 kilometers away, about 15 million years ago. We know all of these rocks are impact debris because they contain shatter cones indicating a violent origin. Not only did these bits of debris confound expectations, but their shatter cones implied shock-wave pressures far too low to achieve lunar and Martian escape velocities, or even the velocity necessary to propel that chunk of Malm limestone 200 kilometers. Something was wrong somewhere. It has turned out that shock-wave theory had been misapplied. It is not the pressure that is important in ejecting bits of debris from around the impact site, but rather it is the pressure gradient. Anomaly extirpated! (Melosh, H.J .; "Blasting Rocks Off Planets," Nature, 363:498, ...
Terms matched: 1 - Score: 81 - 15 May 2017 - URL: /sf089/sf089g11.htm
... Science Frontiers ONLINE No. 100: Jul-Aug 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A POT POURRI OF MARTIAN CUSIOSITIES (AND WE DON'T MEAN "FACES" AND "PYRAMIDS")A shadow and grid-like pattern. ". .. the recent Phobos probe that the Russians sent to Mars in 1988 -- which met a mysterious and untimely demise -- recorded two quite mysterious Anomalies on the planet before contact was lost with the satellite. One was a strange shadow moving across the planet's surface (not a shadow of either of Mars' moons)! The other anomaly was a strange grid-like pattern at one location on the Martian surface; it was photographed with an infrared camera on Phobos 2, the first such instrument carried on a spacecraft sent to Mars." (Ref. 1) The canals are still there -- in a shadowy way ! Commenting upon the theory that those Martian canals that keep showing up on plates made through terrestrial telescopes are only picture/film defects, D. Louderback points out that the: ". .. canals are also showing up on CCD [Charge-Coupled Device] camera photos like the one taken by Donald Parker with a 12.5 -inch reflector and shown on the cover of the Strolling Astronomer earlier this year. It clearly showed a pentagonal pattern of canals surrounding Elysium. It is almost certain that these were not a 'picture defect'!" (Ref. 1) Searching for explanations, J ...
Terms matched: 1 - Score: 79 - 15 May 2017 - URL: /sf100/sf100a03.htm
... Science Frontiers ONLINE No. 51: May-Jun 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Were titius and bode right?For a couple of centuries, astronomers have been trying to explain in physical terms why the empirical and very simple formula of Titius and Bode works so well. It is only an unimposing geometric progression, which, if one inserts the earth's average distance from the sun, yields the distances of the other planets with enough accuracy to perturb astronomers. You see, all scientists abhor numerology. They must insist that the Titius-Bode Law has physical underpinnings. S. Weldenschilling and D. Davis now propose that the planets owe their present positions to a combination of two effects: The frictional drag of the gas in the solar nebula, which favors the presence of small planets in the inner solar system. Gravitational perturbations that create favored places for the coalesceing of planets. C. Patterson has expanded on this suggestion and finds that a model based on these effects works quite well for Jupiter and beyond, where planets are "bound together" in an interlocking system of orbital-period resonances. (See diagram.) Several important anomalies persist, however. That vacant niche between Uranus and Neptune is presently unexplained. In the inner solar system, the presence of Mercury is "embarrassing." (Anonymous; "Were Titius and Bode Right?" Sky and Telescope, 73:371, 1987. Reference. The "problem" of Mercury is treated in AHB2 in The Moon and the ...
Terms matched: 1 - Score: 78 - 15 May 2017 - URL: /sf051/sf051a04.htm
... Science Frontiers ONLINE No. 101: Sep-Oct 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Alh 84001: a message from mars or perhaps some other planet ALH 84001 is a meteorite picked up in the Allan Hills of Antarctica a decade ago. Its composition and fused crust suggest an extraterrestrial -- origin probably Mars. Space scientists think ALH 84001 was blasted off the Martian surface by an impacting body 14-18 million years ago, based upon its exposure to cosmic rays while circling the sun, edging ever closer to earth. The composition of ALH 84001 tells us curious facts about its place of origin. First, it contains carbonate minerals deposited by water. Second, the carbonate grains are banded, implying the parent rock formation was washed by water more than once. Third, and most interesting, chemists have found traces of molecules called PAHs, based on interconnected benzene rings. Three sources have been proposed for these PAHs: Terrestrial contamination Prebiotic activity on the planet of origin PAH-bearing comets and/or asteroids impacting the parent planet. Terrestrial contamination has always been a problem in analyzing meteorites, but great care has been taken in recent years, especially with the Antarctic lode of meteorites. In view of these precautions, it seems rather likely that somewhere "out there" life is brewing. (Anonymous; "A Chip Off the Old Mars," Sky and Telescope , 90:12, July 1995.) Reference: See also: Incredible Life for the interesting history of past "discoveries of life ...
Terms matched: 1 - Score: 78 - 15 May 2017 - URL: /sf101/sf101a03.htm
... Science Frontiers ONLINE No. 31: Jan-Feb 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects What causes the sunspot cycle?Even since the sunspot cycle was discovered, a few people have been trying to prove that it is caused by the influence of the planets, particularly Jupiter with its 11.86-year period. A century of various correlations has convinced almost no one. John P. Bagby has now introduced a new piece to the puzzle of solar-system cyclic behavior. While searching for possible perturbations of the planets due to a tenth major planet or a dark massive solar companion (MSC), he discovered that the perihelia of the outer planets (orbital points closest to the sun) were being disturbed with an average period of 11.2 years. This is almost exactly the sunspot period. This serendipitous finding caused Bagby to wonder whether some common influence was causing not only the sunspot cycle and those perturbations in outer-planet perihelia but also cyclic volcanic and seismic activity on earth. Some correlations indeed do indicate a sun-earth link of some sort. Bagby suggests two possibilities: (1 ) Mutual resonance effects between the planets, (2 ) The effects of a massive solar companion. (Bagby, John P.; "New Support for the Planetary Theory of Sunspots," privately circulated paper, 1983.) Comment. Even "farther out" is the thought that gravitational waves or some unrecognized influence from the galaxy or beyond causes the whole solar system to "ring." In ...
Terms matched: 1 - Score: 76 - 15 May 2017 - URL: /sf031/sf031p04.htm
... Graphic Artifacts I 2003: Archeological Anomalies: Small Artifacts 2003: Scientific Anomalies and other Provocative Phenomena 2001: Remarkable Luminous Phenomena in Nature 2001: Ancient Structures (Archeology) 1999: Ancient Infrastructure (Archeology) 1998: Biological Anomalies: Birds 1996: Biological Anomalies: Mammals II: 1995: Biological Anomalies: Mammals I 1994: Science Frontiers, The Book 1994: Biological Anomalies: Humans III 1993: Biological Anomalies: Humans II 1992: Biological Anomalies: Humans I 1991: Inner Earth: A Search for Anomalies (Geological) 1990: Neglected Geological Anomalies 1989: Anomalies in Geology: Physical, Chemical, Biological 1988: Carolina Bays, Mima Mounds, Submarine Canyons (Geological) 1987: Stars, Galaxies, Cosmos 1986: The Sun and Solar System Debris 1985: The Moon and the Planets 1984: Rare Halos, Mirages, Anomalous Rainbows (Geophysics) 1983: Earthquakes, Tides, Unidentified Sounds (Geophysics) 1983: Tornados, Dark days, Anomalous Precipitation (Geophysics) 1982: Lightning, Auroras, Nocturnal Lights (Geophysics) 1982: Unfathomed Mind 1981: Incredible life (Biology) 1980: Unknown Earth (Geological) 1979: Mysterious Universe (Astronomy) 1978: Ancient Man (Archeology) 1977: Handbook of Unusual Natural Phenonema Sourcebook Series 1978: Strange Planet E2 1977: Strange Universe A1 1976: Strange Artifact M2 1976: Strange Minds P1 1976: Strange Life B1 1975: Strange Planet E1 1975: Strange Universe A1 1974: Strange Artifact M1 1974: Strange Phenomena G2 1974: Strange Phenomena G1 Home Page The Sourcebook Project (Catalog of Anomalies)Oct 2021 ...
Terms matched: 1 - Score: 74 - 10 Oct 2021 - URL: /sourcebk.htm
... Science Frontiers ONLINE No. 40: Jul-Aug 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Planets as sun-triggered lasers Apparently both the earth and Jupiter emit radio energy when triggered by bursts of radio waves arriving from the sun. The outer atmospheres of these planets act like radio lasers, which store radio energy and then release it suddenly when stimulated by weaker solar signals. The earth's laser operates between frequencies of 50 and 600 kilohertz. Its emissions are known as the "auroral kilometric radiation" or AKR. While some of these terrestrial emissions are spontaneous, others are stimulated by Type-III solar radio bursts. The newly discovered Jovian laser operates at hectometric wavelengths and is also triggered by the solar radio bursts. (Calvert, W.; "Triggered Jovian Radio Emissions," Geophysical Research Letters, 12:179, 1985.) Comment. Earth and Jupiter thus act like radio transponders, releasing large bursts in response to small solar stimuli. The role of electricity in the history of the solar system is only beginning to be appreciated. Of course, the radio lasers mentioned above are not very powerful, but what might have occurred during the formative stages of the solar system? Could electromagnetic forces have been more important then than they are now? In this regard, note that electrical forces seem to be strongly involved in the dynamics of Saturn's rings. And Saturn's rings themselves may resemble a miniature solar system in the accretion phase. From Science Frontiers #40, JUL- ...
Terms matched: 1 - Score: 72 - 15 May 2017 - URL: /sf040/sf040p03.htm
... Science Frontiers ONLINE No. 25: Jan-Feb 1983 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects More on "the massive solar companion"Something big out there beyond Neptune perturbs the orbits of the sun's outer fringe of planets. In addition, there are unexplained perturbations in the orbits of earth satellites, peculiar periodicities in the sunspot cycle, and equally puzzling regularities in earthquake frequency. Infrared detectors have also picked up unidentified objects in the sky. These anomalies might all be explained by the existence of a large, dark planet with several moons -- or, if the mystery object turns out to be very far away, by a very large, dark stellar companion of our sun with its own system of planets. Several astronomers have been trying to pin down the properties of this Planet X or Massive Solar Companion (MSC). John P. Bagby has recently published a novel solution to this nagging puzzle in celestial mechanics. He suggests that the Massive Solar Companion is actually a distributed system; that is, appreciable mass also occupies the several stable Lagrangian points. The total MSC mass might be as much as half the sun's mass, perhaps 100 Astronomical Units (100 times the earth's distance from the sun.) If the MSC and its attendants are this massive, astronomers will have to revise the mass and density of the sun downward by a good bit. (What they have done in the past is estimate the mass of the solar system as a whole and assumed it mostly resides ...
Terms matched: 1 - Score: 71 - 15 May 2017 - URL: /sf025/sf025p03.htm
... Science Frontiers ONLINE No. 131: SEP-OCT 2000 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Planetary Conjunctions that Changed the World On May 17, 2000, five solar-system planets (Mercury, Venus, Mars, Jupiter, Saturn) plus the moon slowly wheeled into a tight 19 arc. It was a notable heavenly conjunction. All manner of natural catastrophes were predicted but failed to materialize. It has been this way down recorded history. Universal deluges were anticipated during similar conjunctions on September 14, 1186, and February 19, 1524, but the weather refused to cooperate with the planets. Humanity survived nicely. This does not mean that historical upheavals are never correlated with planetary conjunctions. If a society believes strongly enough in the power of the stars and planets to shape human destiny, events may be correlated with the heavens. Such was the case in ancient China. In China, the "Mandate of Heaven" concept has been used since ancient times as both a framework for history and a guide to future actions. The basic idea is that Heaven awards ruling power to a sage-king because of his virtue. His descendants remain as Earthly deputies until they become corrupted, whereupon outraged Heaven gives signs in the sky that the Mandate has passed on to a different sage-king to continue the cycle. Three transfers of the Heavenly Man-date marked the beginnings of the Hsu, Shang, and Chou Dynasties. In fact, the tightest grouping of the five visible planets in the period from 3, ...
Terms matched: 1 - Score: 68 - 15 May 2017 - URL: /sf131/sf131p03.htm
... now and then, but a steady rain so intense that over geological time some major geological consequences must ensue. (See SF#44.) Some observers commented that surely these scientists have thrown away their careers by suggesting something so ridiculous. But the data are there -- in the form of dark spots on satellite images of the earth's dayglow -- and late results continue to support this far-out interpretation, ridiculous or not. "The mass of these objects is estimated at about 108 gm each, and the total flux is about 107 small comets per year. If this flux is representative of the average flux over geologic time, then the water influx is sufficient to fill the Earth's oceans. The fluxes of these objects are also large for all the planets outside the orbit of Earth. Considerations of thermal stability imply that the fluxes of comets that impact Venus are considerably less. The outer giant planets may be significantly heated relative to solar insolation by the small-comet impacts. For example, the total energy input due both to solar insolation and comet impacts may be similar for Uranus and Neptune. Thus it is possible that the temperatures of these two planets are similar, even though Neptune is farther from the Sun." (Frank, L.A ., et al; "On the Presence of Small Comets in the Solar System," Eos, 68:343, 1987.) Comment. What has all this to do with "cosmic Gaia"? By "cosmic Gaia" we mean the cosmic version of the conventional ...
Terms matched: 1 - Score: 67 - 15 May 2017 - URL: /sf052/sf052a03.htm
... Science Frontiers ONLINE No. 70: Jul-Aug 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Tilted Planetary Magnetic Fields The axis of the earth's magnetic field is tilted about 11 away from our planet's axis of rotation. This tilt is embarrassing to the reigning "dynamo theory," in which the axes of the magnetic field and rotation are presumed to be aligned. The situation is even worse with some the other planets; viz., Uranus with 60 and Neptune with 47 . Jupiter's tilt is 10 , while Saturn's is only 1 . Clearly, something is awry. Two possibilities are: (1 ) The dynamo theory is incorrect; or (2 ) The magnetic fields measured by spacecraft are actually combinations of central, dynamocreated, dipole fields, which are aligned with the axes of rotation, and "other" dipole fields originating in the outermost portions of the planetary cores. If the latter solution to the dilemma is correct, we must account for the origin and disposition of these "other" dipoles. (Eberhart, J.; "Straightening the Magnetic Tilts of Planets," Science News, 137:294, 1990.) Reference. The anomalously titled magnetic fields of planets are cataloged in The Moon and the Planets. For details on this book, visit: here . From Science Frontiers #70, JUL-AUG 1990 . 1990-2000 William R. Corliss ...
Terms matched: 1 - Score: 65 - 15 May 2017 - URL: /sf070/sf070a04.htm
... Science Frontiers ONLINE No. 18: Nov-Dec 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Long Arms Of Venus And Jupiter Many times in the two or three "scientific" centuries now behind us, investigators have discovered, almost against their wills, that the moon and planets affect the earth. The moon's influence is understandable, but the planets are too far away for their gravitational fields to influence one terrestrial dust mote. Well, here is one more study showing that the planets (Venus and Jupiter, in this case) do affect the peak electron density in the earth's ionosphere. The effect is most noticeable when these planets are close to earth and dwindles as they swing around to the other side of the sun. The authors are at a loss to explain this effect in terms of gravitation, suggesting that perhaps Venus or Jupiter may instead affect solar activity, which in turn modifies the terrestrial ionosphere. (Harnischmacher, E., and Rawer, K.; "Lunar and Planetary Influences upon the Peak Electron Density of the Ionosphere," Journal of Atmospheric and Terrestrial Electricity, 43:643, 1981.) Comment. Actually, no one has shown how the planets can possibly influence the sun with known action-at-a -distance forces. Electrical forces are taboo. There are no other "recognized" forces. From Science Frontiers #18, NOV-DEC 1981 . 1981-2000 William R. Corliss ...
Terms matched: 1 - Score: 65 - 15 May 2017 - URL: /sf018/sf018p10.htm
... Science Frontiers ONLINE No. 3: April 1978 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Marsh gas or the planet venus?October 16, 1976. Aboard the m.t . Farnelia, Barents Sea fishing grounds. Observers, Skipper H. Powdrell and Mr. G. Christmas, Radio Officer. "At 2307 GMT while I was visiting the wheelhouse, the Skipper pointed out to me an object flying across the sky. It had already been in view for some five minutes or more and was first observed on a bearing of 140 T heading due North. I first sighted it on a bearing of 050 T. "Observation was constantly kept by myself and the Skipper with the aid of binoculars from the time I first sighted the object. It could be described as being a brilliant light travelling at a very high altitude, leaving a bright Vshaped trail of rays which could be likened to the sun's rays as they would appear from behind a cloud. However, they were very much smaller due to the height and were also horizontal. The object followed a course from south to north to be astern of us at 2308. It then commenced to come back along its course while losing altitude. I would point out here that there was no visual evidence of the object actually turning back but rather as though it had been put into reverse. "The appearance and shape of the object was now changed, becoming totally circular in shape, still losing height and coming closer. The outer edge of the circle ...
Terms matched: 1 - Score: 57 - 15 May 2017 - URL: /sf003/sf003p10.htm
... Science Frontiers ONLINE No. 120: Nov-Dec 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Bye-bye Mercury, and Maybe Mars During the 1950s, the campaign of mainstream science to discredit Velikovsky assured the public that the solar system was the epitome of stability -- wayward planets were impossible. Then along came chaos theory which implied that the flight of a butterfly in Brazil could, in principle, affect weather in Canada. In effect, a slight change in initial conditions could, in the fullness of time, have very large effects. Now, it is generally admitted that the solar system is chaotic after all. Each planet is subject to the tiny, butterfly-like gravitational tugs of the other planets, especially Jupiter. Given enough time, these gravitational nuances can result in the ejection of a planet from the solar system -- and may already have done so in the past! Mercury and Mars are the most vulnerable on a billion-year time scale. In the case of Mercury, its orbit will become more and more elliptical according to computer simulations. Eventually a close gravitational encounter with Venus is possible. This could send Mercury careening off into deep space. The probability of this happening is only 1 in a 1000 over 5 billion years, but it is not zero. Mars might likewise be ejected by a passing nudge from earth. However, this encounter could go the other way. Depending upon the celestial dynamics of the encounter, Mars might gravitationally fling earth out into the Galaxy, and ...
Terms matched: 1 - Score: 56 - 15 May 2017 - URL: /sf120/sf120p03.htm
... Science Frontiers ONLINE No. 70: Jul-Aug 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects "TAIL WAGS DOG" IN SOLAR SYSTEM The Oort Cloud of comets hovering at the far frontiers of the solar system is, as we know from SF#57, not without its anomalies. Here, let us assume that it really does exist, even though we cannot see it. From a new book by I. Asimov (title below), we learn that this remote haze of icy fluff, the Oort Cloud, may really have about 90% of the angular momentum of the entire solar system. It was already sufficiently anomalous to discover that the planets possess fifty times the angular momentum of the much more massive sun. (See ABB3 in The Sun and Solar System Debris.) Astronomers have been attempting for years to explain this 50:1 split. Now, with the Oort Cloud apparently having ten times the angular momentum of the planets, the situation is much worse. According to Asimov, the solar-system angular momentum is split as follows: Oort Cloud 90% All of the planets 9.8 % The sun 0.2 % The total mass of the Oort Cloud is estimated to be roughly that of Saturn. The recent flyby of Halley's Comet created this dilemma. It was discovered that Halley was a chunk containing 140 cubic miles of ice - much larger than anticipated for this "typical" comet. If the estimated 2 trillion comets are, on the average, Halley' ...
Terms matched: 1 - Score: 55 - 15 May 2017 - URL: /sf070/sf070a02.htm
... Science Frontiers ONLINE No. 63: May-Jun 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A Hex On Saturn "By piecing together pictures of Saturn taken by the Voyager-2 spacecraft, David A. Godfrey (National Optical Astronomy Observatories) has discovered an unusual feature in the planet's atmosphere. His mosaics reveal a hexagon centered on the north pole. Since neither probe flew directly over the pole, the complete scene has to be created by 'stretching' a series of photographs taken from the side as Saturn rotated, then fitting them into a polar projection." The straight sides of the hexagon are each about 13,800 kilometers long. The entire structure rotates with a period of 10h 39m 24s, the same period as that of the planet's radio emissions, which is assumed to be equal to the period of rotation of Saturn's interior. The hexagonal feature does not shift in longitude like the other clouds in the visible atmosphere. The pattern's origin is a matter of much speculation. Most astronomers seem to favor some sort of standing-wave pattern in the atmosphere; but the hexagon might be a novel sort of aurora. More extreme speculation has Saturn's radio emissions emanating from the hexagon (something we can see and which has the right rotation period) rather than from the planet's interior (something we cannot see). (Anonymous; "A Hex on Saturn," Sky and Telescope, 77:246, 1989.) Comment. Note ...
Terms matched: 1 - Score: 55 - 15 May 2017 - URL: /sf063/sf063a04.htm
... Science Frontiers ONLINE No. 97: Jan-Feb 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Solar-system puzzles In the 30-or-so years that space probes have been visiting the solar system's other planets, much has been learned, but there are now more questions than ever. We now pose four of these -- none of them could even have been asked before the space program. Not only is the magnetic axis of Uranus tilted grotesquely away from the planet's axis of rotation, but the latter lies almost in Uranus' orbital plane. Q1. Why are the magnetic fields of Neptune and Uranus tilted at such grotesque angles with the axes of rotation? A1. Probably because of giant impacts. Q2. "Why does Mercury have an iron core twice as massive, relative to its size, as any other rocky planet?" A2. Probably because a giant impact tore off its rocky mantle. Q3. "How can Neptune sustain 1400-kilometer-per-hour winds -- faster than Jupiter's -- when it is so far from the sun, whose heat powers atmospheric circulation?" A3. ?? Q4. "How could Mars -- now more than 50 C below freezing -- have been warm enough in its early days to have water flowing on its surface?" A4. Possibly due to geothermal heat. (Kerr, Richard A.; "The Solar System's New Diversity," Science, 265:1360, 1994 ...
Terms matched: 1 - Score: 53 - 15 May 2017 - URL: /sf097/sf097a05.htm
... Science Frontiers ONLINE No. 116: Mar-Apr 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Plant Life On Mars?" Strong evidence that plant life exists on Mars was advanced today by Earl C. Slipher, American astronomer, after observation of the planet, which is closer to the earth this month than at any time since 1924. .. .. . "His theory is founded on an apparent change in the planet's surface, regarded as his most important discovery. "The huge dark spot (Solis Lacus) or the Great Eye of Mars, seems to have assumed a shape not observed for fifty years, if ever before. Mr. Slipher indicated that this was strong evidence that plant life existed on the planet, and suggested that the change was due to fresh vegetation over an area roughly the size of the United States." (Anonymous; "Evidence of Plant Life on the Planet Mars Is Announced by an American Astronomer," New York Times, July 21, 1939. Cr. M. Piechota.) Comment. What a difference 59 years make! Could those tiny structures in ALH 84001 be fossilized pollen grains? From Science Frontiers #116, MAR-APR 1998 . 1998-2000 William R. Corliss ...
Terms matched: 1 - Score: 53 - 15 May 2017 - URL: /sf116/sf116p04.htm
... Science Frontiers ONLINE No. 91: Jan-Feb 1994 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Two-faced planets and moons Several solar-system objects present asymmetrical visages to our telescopes. Mars is a classic case, being much more heavily cratered in its southern hemisphere than its northern. But the dichotomies are not restricted to cratering, as we shall now see. Neptune . Recently, H.B . Hammel, using the University of Hawaii's 2.2 -meter telescope, discovered that Neptune's northern hemisphere is now brighter than its southern -- something never observed before. During the past eight years, the southern hemisphere has been consistently brighter, although the hemispheres were of roughly equal brightness during the late 1970s. The cause of these brightness changes remains a mystery. (Cowen, Ron; "Neptune's Northern Half Grows Brighter," Science News, 144:287, 1993.) Iapetus . This satellite of Saturn is dark on one half and light on the other. Quantitatively speaking, the bright side reflects ten times more incident light than the other. An explanation is suggested by the fact that the dark side points in the satellite's direction of motion. A recent study of 12 Voyager images of Iapetus also imply an exogenous (externally imposed) origin of the dark surface, because they show a gradual rather than sharp transition between the dark and light regions. The thought of planetary scientists is that micrometeoroids bombard the leading hemisphere of Iapetus preferentially and in the process volatilize ...
Terms matched: 1 - Score: 52 - 15 May 2017 - URL: /sf091/sf091a04.htm
... Science Frontiers ONLINE No. 66: Nov-Dec 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Neptune Spins Too Fast And Its Magnetic Field Is Awry Some pre-Voyager theories about Neptune have been severely tried by the data trickling back to earth across the great gulf separating us from what is now the most distant planet. Before Voyager, Neptune's spin period was believed to be about 17 hours. This was just the spin rate needed by theorists to explain why Neptune radiates much more heat than Uranus. It seems that spin rate is related to the mixing of a planet's molten innards, which in turn affects the rate at which heat reaches the surface where it is radiated away. With Neptune's period now pegged at 16 hours by Voyager's measurements, the mixing-cooling theory is in trouble. The magnetic-field situation is in even worse shape. When planetary scientists found that Uranus' magnetic field was tilted 60 from the axis of rotation, they worried a bit but didn't think that this one exception would overthrow the favored dynamo theory of field generation. After all, the magnetic fields of Jupiter, Saturn, and earth are reasonably well-behaved. But Neptune's field is now found to be misaligned by 50 ! The confidence of the planetologists has now been shaken. What, if anything, is different about Neptune and Uranus? It may just be that we don't really know how the magnetic field of any planet is generated. (Kerr, ...
Terms matched: 1 - Score: 52 - 15 May 2017 - URL: /sf066/sf066a05.htm
... Science Frontiers ONLINE No. 90: Nov-Dec 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A New Class Of Solar System Objects For decades astronomers have suspected and searched for Planet X, a large body beyond Neptune swinging slowly about the sun and gravitationally perturbing Neptune's orbit. Planet X has never been found, but somewhere out there are some pretty hefty bodies, as described by T. Van Flandern: "The discovery of a second miniplanet beyond Neptune, 1993 FW, augments the discovery of 1992 QB1 last fall. Both objects are believed to be in the 200-300-km-diameter range, with magnitudes between 2324, distances at discovery between 40-45 AU, and low inclinations.... Although the discoverers of these two objects hailed them as the first representatives of the elusive 'Kuiper belt' of comets, other theoreticians have confirmed that the line of reasoning leading to the suggestion of such a belt is spurious. That fact, combined with the absence of any comet-like characteristics in these two new objects, their relative size as compared with any other known comet, and their unusually red coloration, seem to make them the first-discovered members of a new class of solar system bodies. Since the searches leading to their discovery have examined only 1.5 out of tens of thousands of square degrees of sky wherein such objects might be discovered, it seems a reasonable conjecture that thousands of additional similar objects will ultimately be found. In short, it appears at this ...
Terms matched: 1 - Score: 51 - 15 May 2017 - URL: /sf090/sf090a03.htm
... Science Frontiers ONLINE No. 37: Jan-Feb 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Why aren't the martian craters worn down?The preceding, almost-Lowellian vision of a watery Mars is quite different from what the Mariner and Viking spacecraft tell us about the planet's present condition. Wind rather than water is now the main erosional force. The sand dunes and drifts, the wind-shadows behind rocks, and the sand-blasted surfaces all attest to the desertification of Mars. Ronald Greeley, of Arizona State University, and his colleagues have simulated Martian winds in a special wind tunnel at NASA's Ames Research Center. Using spacecraft-measured wind velocities and patterns, they tried to duplicate the Martian erosional environment. The results were a surprise. They implied that the Martian surface should be worn down by wind-driven sand and dust at rates up to 2 centimeters per century. But at that rate, the Martian craters, which are estimated to be hundreds of millions of years old, would have been worn level long ago. The researchers are now wondering what is wrong with their simulation. They venture that the Martian sand may not be "normal," or perhaps the eroding particles do not travel as fast as they figured. (Anonymous; "The Windblown Planet Mars," Sky and Telescope, 68:507, 1984.) Comment. Another interpretation is that Mars has not been desert-like for as long as presently believed. Reference. The subject of ...
Terms matched: 1 - Score: 44 - 15 May 2017 - URL: /sf037/sf037p05.htm
... Science Frontiers ONLINE No. 114: Nov-Dec 1997 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Surface life (us!) only a "special case"T. Gold is again challenging our most cherished ideas about geology and life's domain. In the subject article -- his latest paradigm-shaker -- he first reviews the abundant evidence for the existence of large quantities of primordial hydrocarbons deep within the earth and (probably) many other planets throughout the universe. Associated with these hydrocarbons is a "deep, hot, biosphere." By "deep" Gold means 100 kilometers and more. It is this combination of a deep reservoir of hydrocarbons and life forms (probably mostly bacteria) that can account for (among other things): The fact that all helium comes from oil and gas wells The fact that the composition of petroleum is not what one would expect from the decomposition of plants and animals. It is really a mixture of primordial hydrocarbons with some added biochemical by-products; that is, products of that "deep" biosphere. Since carbonaceous material is now known to be common in the solar system (comets, carbonaceous chondrites, etc.), it is likely that many other planets also possess deep stores of hydrocarbons. In these deep, warm, protected, energyrich "wombs," complex biospheres might readily evolve. In Gold's view, deep biospheres may be the rule and surface life the exception! Finally, Gold sees life as merely a natural process with no ...
Terms matched: 1 - Score: 44 - 15 May 2017 - URL: /sf114/sf114p06.htm
... Science Frontiers ONLINE No. 120: Nov-Dec 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Gaia as a super-superorganism The Gaia hypothesis states that the earth's environment is maintained suitable for life by life itself. Our climate, atmospheric oxygen level, ocean composition, and similar vital conditions are kept livable by life's waste products, such as the oxygen emissions of plants. That something like Gaia is required is seen in the extreme disequilibrium of the earth's atmosphere compared to the near-equilibrium of the atmospheres of apparently lifeless Venus and Mars. For example, our atmosphere's 21% oxygen, a highly reactive gas, is many orders of magnitude higher than one would expect on a lifeless planet. Furthermore, life-friendly conditions have been maintained for billions of years despite large changes in the sun's output and the traumas of asteroid impacts. T.M . Lenton, writing in Nature, asks a salient question: How has planetary self-regulation (Gaia) been established and maintained by evolution and natural selection which operate on the level of individuals? In other words, evolution tells us that organisms should evolve so as to leave the most progeny not so as to regulate the atmosphere. Lenton answers that there must be feedback loops from the planetary environment that steer the evolution of individuals in the "proper" direction. Lenton goes on to explore some of these many feedback mechanisms; one obscure loop involves the production of dimethyl sulfide by marine phytoplankton. Truly, it ...
Terms matched: 1 - Score: 44 - 15 May 2017 - URL: /sf120/sf120p08.htm
... -- at least as far as human aesthetics are concerned. (Other entities might yearn for asymmetry, who knows?) Anyway, Mirror Matter is defined as being palpable and could also be that "missing mass" or "dark matter" that astronomers need to explain why spinning galaxies do not fly apart. Mirror Matter could also account for some mysterious terrestrial phenomena such as that unaccountable lack of a significant crater in Siberia, where the 1908 Tunguska blast leveled a huge forest but hardly disturbed the ground. Recently, Mirror Matter has been invoked to explain the ups and downs of terrestrial biodiversity. R. Foot and Z. Silagadze propose that the 26-millionyear periodicity in terrestrial extinctions -- claimed to be present in the fossil record -- is due to a solar-system planet made of Mirror Matter (and therefore invisible). This postulated planet has a period of 26-million years and regularly gravitationally jostles the Oort Cloud of comets on the periphery of the solar system. These jolts unleash torrents of devastating comets upon the inner solar system every 26-million years, thereby blasting the earth and its sensitive biological cargo. This supposed Mirror-Matter planet happens to be the conceptual double of a Normal-Matter, hypothetical planet named Nemesis, which was proposed in the 1980s to account for the same periodical extinctions in the fossil record. However, diligent searches did not locate Nemesis. Of course, if Nemesis were made of Mirror Matter, as now proposed, it would have escaped telescopic detection then and would still elude our telescopes today! (Schilling, ...
Terms matched: 1 - Score: 43 - 15 May 2017 - URL: /sf136/sf136p03.htm
... Science Frontiers ONLINE No. 39: May-Jun 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Saturn's rings may be young When the Voyager spacecraft swept past Saturn, they radioed back photos of a complex, very dynamic system of rings -- thousands of rings. Studies of these rings have led some astronomers to wonder if they are really as old as Saturn itself. Two lines of thinking suggest a recent origin: (1 ) The rings are composed of both light material (very likely water ice) and dark material (probably rocks and dust). The rocky fragments, according to the prevailing nebular theory, should have condensed early in solar-system history, and then been swept gravitationally into the planet as they were slowed by friction with the uncondensed nebular material. Yet, dark material is still in the rings. (2 ) The incessant bombardment of the rings by meteorites should have pulverized the rings, sending fragments and vaporized material in all directions. In just 10 million years the rings should have been largely erased. They are still there. (Cuzzi, Jeffrey N.; "Ringed Planets: Still Mysterious -- II," Sky and Telescope, 69:19, 1985.) Comment. Assuming the rings are young, where did they come from? What happened to Saturn in "recent" times? Reference. Several lines of evidence point to the youth of Saturn's rings. See: ARL16 in our catalog The Moon and the Planets. Ordering information here . From ...
Terms matched: 1 - Score: 42 - 15 May 2017 - URL: /sf039/sf039p07.htm
... Science Frontiers ONLINE No. 130: JUL-AUG 2000 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Drifters Sure, there may now be or once have been primitive life forms on Mars, but there does seem to be a serious shortage of carbon-based life forms elsewhere in the universe. In fact, there seems to be a great dearth of small, cool, solid, water-and-carbon-rich planets circling beneficent suns. Can it be that we are looking for extraterrestrial life in the wrong places? Life may have originated and prospered on the multitude of sun-less aggregations of matter drifting through the void, some doubtless quite close to us. Myriad nomadic planets may be roaming our Galaxy free from the clutches of parent stars. Two teams of astronomers think they have detected 25 of these free-floating planets, and say there could be hundreds of millions of them wandering the Milky Way. These free-floaters or "drifters" were created when small clouds of gas and dust coalesced under gravity's urging. If such collapsing clouds were less than 80 times Jupiter's mass, they would not be able to sustain nuclear reactions and become long-lived stars. Many would be-come "brown dwarfs." Still smaller aggregations -- less than 14 Jupiters -- would never shine at all. These would remain warm for a while as they dissipated the gravitational energy that created them. Such small objects would be temporarily detectable by infrared telescopes. Hundreds of such infrared " ...
Terms matched: 1 - Score: 42 - 15 May 2017 - URL: /sf130/sf130p04.htm
... Science Frontiers ONLINE No. 72: Nov-Dec 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects At last, a theory of everything!" A Soviet astrophysicist has made the startling claim that the Earth and other astronomical bodies may be riddled with mini black holes -- objects smaller than atoms but with masses which, in some cases, might be as great as a planet. Such objects, he claims, could account for volcanic hot spots, gravitational anomalies, concentrations of mass on the Moon (mascons), the existence of the rings of Saturn, and even the observations that gave rise to the notion of a 'fifth force.'" J. Gribbin, whose article begins with the above paragraph, is quick to proclaim that this "theory of everything" is not just silly-season kite flying. Rather, it was proposed by A.P . Trofimenko in the well-respected Astrophysics and Space Science (168:277) Restricting ourselves to speculations concerning the earth, Trofimenko sees our planet as a sphere of low-density material enclosing 126 mini black holes that account, first, for the many gravity anomalies we measure on the surface; and, second, the earth's high density. That's right, there's no iron core in this model! Some of the mini black holes near the surface create local hot spots (plumes, volcanos, etc.) through the emission of Hawking radiation. Trofimen-ko's scheme encompasses the planets, the stars, ...
Terms matched: 1 - Score: 42 - 15 May 2017 - URL: /sf072/sf072a04.htm
... Science Frontiers ONLINE No. 101: Sep-Oct 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The metal-frosted mountains of venus! Venus is a very hot planet with a mean surface temperature of 740 K. It is so hot there that some metal compounds of chlorine, fluorine, and sulfur are vaporized in some locales. Such metallic "mists" could well coat out as "frost" on the cooler, higher elevations. Actually, two outstanding Venusian anomalies can be explained by such metallic "frosts." Radar signals from earth are strongly reflected from the planet's mountains and high plateaus. These regions may owe their unusually high reflectance to metallic "frosts" consisting of such radarbright minerals as pyrite, which is probably present in vapor form at lower, hotter elevations. During the 1978 Pioneer Venus mission, four instrumented probes plunged into the Venusian atmosphere. All instruments with external sensors on all four probes failed mysteriously 12.5 kilometers above the planet's surface. Thinking is that the probes pierced a cloud deck of metallic vapor that condensed on the cold sensor surfaces. (Anonymous; "Metal 'Frost' on Venus?" Sky and Telescope, 90:13, August 1995.) From Science Frontiers #101 Sep-Oct 1995 . 1995-2000 William R. Corliss ...
Terms matched: 1 - Score: 42 - 15 May 2017 - URL: /sf101/sf101a02.htm
... Science Frontiers ONLINE No. 99: May-Jun 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Ballistic Panspermia Scientists are already convinced that cratering events on the moon and Mars have propelled rocky debris in the direction of the earth, and that some of these fragments have landed here in the guise of meteorites. A logical question is: Can life forms and/or chemical precursors of life be transported thus across the far reaches of the solar system? Can one planet infect another ballistically? An analysis by M.K . Wallis and N.C . Wickramasinghe is rather warm towards this idea: "The mass of escaping ejecta from the presumed 10-km comet that caused the 180-km Chicxulub crater, with a radius of roughly 10 km and 1 m deep, amounted to ~300 Mm3 , of which one third may have been rock and 10% higher-speed ejecta that could have transited directly to Mars. It may have taken 10 Ma to impact Mars but...the probability is not exceedingly low but 0.1 -1 %. "The survival and replication of microorganisms once they are released at destination would depend on the local conditions that prevail. Although viability on the present-day Martian surface is problematical, Earth-to-Mars transfers of life were feasible during an earlier 'wet' phase of the planet, prior to 3.5 Ga ago. The Martian atmosphere was also denser at that epoch, with several bars of CO2 , thus serving to decelerate meteorites, as ...
Terms matched: 1 - Score: 42 - 15 May 2017 - URL: /sf099/sf099g10.htm
... Science Frontiers ONLINE No. 117: May-June 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Flat Face Of Mars Mars has two puzzling "faces": (1 ) That human-like visage at Cydonia; and (2 ) The whole northern hemisphere or "face." The latter is definitely real and consists of an immense, low-lying plain centered roughly on the planet's North Pole. The opposite face of Mars is occupied by rough, cratered highlands. This sharp, profound crustal dichotomy has been known for many years and has resisted explanation. In SF#113, T. Van Flandern advanced the theory that the rugged southern highlands are composed of the debris from an exploded planet which Mars once attended as a satellite. Be that as it may, there is something puzzling about the northern plains. We now have information from the Mars Global Surveyor (MGS), now orbitting the red planet, that the low-lying northern plains are much flatter than thought. For thousands of kilometers, they are smooth on a scale of hundreds of meters. This is flatter than the lava flows of the lunar maria; flatter than the smoothest central Sahara. These startling data come from the MGS's laser altimeter that can measure elevation of the terrain below it with 10meter accuracy averaged over the beam width of 150 meters. The only known terrain in the entire solar system that can match this flatness is the abyssal, sediment-filled floor of the South Atlantic. Hmmm! Does this ...
Terms matched: 1 - Score: 38 - 15 May 2017 - URL: /sf117/sf117p02.htm
... Science Frontiers ONLINE No. 73: Jan-Feb 1991 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Venus Too Pristine In the November 16 issue of Science, R.A . Kerr remarks: "The planetary geologists who are studying the radar images streaming back from Magellan [the space probe] find that they have an enigma on their hands. When they read the geological clock that tells them how old the Venusian surface is, they find a planet on the brink of adolescence. But when they look at the surface itself, they see a newborn babe." (Kerr, Richard A.; "Venus Is Looking Too Pristine," Science, 250:913, 1990.) Comment. Of the 75 craters mapped so far by Magellan , only one shows any signs of aging; i.e ., tectonic movements, lava-filling, etc. The surface of Venus should be hundreds of millions of years old, yet it looks freshly minted. The anticipated spectrum of degradation has not yet been seen. One theory is that recent lava flooding erased the old craters, and we now see only recent impact scars. But why would a planet's volcanism turn off so completely and so abruptly? Our earth, Venus' sister planet in many ways, still perks away, leaving craters of various ages. Why is Venus so different? One idea not advanced by Kerr in Science is that Venus might be a recently acquired member of the solar system! From Science Frontiers #73, JAN- ...
Terms matched: 1 - Score: 37 - 15 May 2017 - URL: /sf073/sf073a04.htm
... Science Frontiers ONLINE No. 61: Jan-Feb 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Celestial burlesque?Astronomers have long wondered about Mercury. Its density (5 .44) is unusually high for such a small planet, and its orbit's inclination (7 ) and eccentricity (0 .206) are also anomalously high. In one blow. W. Benz, A.G .W . Cameron, and W. Slattery may have solved all three problems. Four frames from a computer simulation of proto-Mercury being stripped of its lighter, outer crust by a collision. Frame times are -1 , + 2.3 , + 7.7 , and + 41.7 minutes after impact. The dark molten sheet of iron in Frame #4 will collapse into a sphere, while the silicates will escape Mercury's gravitational pull. They think Mercury's original, lighter, silicate outer layers were stripped off during the impact of one of the small protoplanets that are thought to have swirled around the inner solar system shortly after its formation. Computations on a supercomputer revealed to these three researchers that, if the protoplanet had hit Mercury at between 20 and 30 kilometers/second, then its dense iron core would have survived pretty much intact. A lower velocity would not have stripped off the lighter outer layers; anything higher would have blasted the whole planet into smithereens. Calculations of this type also suggest that if a protoplanet the size of Mars had hit protoearth, it likewise would ...
Terms matched: 1 - Score: 35 - 15 May 2017 - URL: /sf061/sf061a03.htm
... Science Frontiers ONLINE No. 78: Nov-Dec 1991 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Terraforming Mars The concept of terraforming a planet is an old standby of science fiction; it is the process by which a technologically advanced race manipulates the surface and atmosphere of an uninhabitable planet so that it becomes inhabitable. We humans know to our dismay that we have the capacity to modify the earth's environment, but could we perhaps exercise better judgment and terraform Mars? C.P . McKay et al have looked into this possibility: "From our analysis, one could propose the following sequence of events: production of CFCs (or other greenhouse gases) starts on Mars and the surface temperature warms up by about 20 K. The regolith and polar caps release their CO2 and the pressure rises to 100 mbar. One of two things could then happen. If there were large regolith and polar CO2 reservoirs, the pressure would continue to rise on its own. If these were absent, the CO2 pressure would stabilize, and additional CO2 would have to be released from carbonate minerals. At this point (perhaps between 100 and 105 years) Mars may be suitable for plants. If there was a mechanism for sequestering the reduced carbon, these plants could slowly transform the CO2 to produce an O2-rich atmosphere in perhaps 100,000 years. If sufficient N2 could also be released from putative soil deposits, and the CO2 level kept low enough, then a human- breathable atmosphere could be produced. (McKay, ...
Terms matched: 1 - Score: 35 - 15 May 2017 - URL: /sf078/sf078a05.htm
