14 results found.
... Science Frontiers ONLINE No. 62: Mar-Apr 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects More challenges to newton's law of gravitation Two experiments reported at the 1988 meeting of the American Geophysical Union in San Francisco can be added to the others that question Newton's venerable Law of Gravitation. The abstracts of these papers are short and to-the-point, so we quote them: "We have performed an experimental test of Newton's inverse-square law of gravitation. The test compared accurately measured gravity values along the 600 m WTVD tower near Raleigh, North Carolina, with upward, continued gravity estimates calculated from ground measurements. We found a significant departure from the inverse-square law, asymptotically approaching -547 36 microGal at the top of the tower. If this departure is derived from a scalar Yukawa potential, the coupling parameter is alpha = 0.023, the range is lambda = 280 m, and the Newtonian Gravitational Constant is G = (6 .52 0.01) x 1011 m3 kg-1 s-2 . We do not yet have adequate resolution to discriminate this scalar model from a scalarvector model." (Eckhardt, D.H ., et al; "Experimental Evidence for a Violation of Newton's Inverse-Square Law of Gravitation," Eos, 69:1046, 1988.) "In the late summer of 1987, an ex periment was performed to determine the value of the Newtonian gravitational constant, G, by measuring the ...
Terms matched: 1 - Score: 142 - 15 May 2017 - URL: /sf062/sf062p13.htm
... Science Frontiers ONLINE No. 55: Jan-Feb 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Goethe's optics reevaluated "It is beyond dispute that the main objective of the polemical part of Goethe's Farbenlehre, namely, the refutation of Newton's Obticks, was a misguided one. Many consider it to be inexplicable that a man of Goethe's intellectual standing should have behaved in such an apparently irrational manner. It so happens, however, that the characteristics of the subjective spectrum are more akin to Goethe's model than to Newton's . It is true that Goethe put an incorrect interpretation upon what he saw -- and was the first to see -- but a careful scrutiny of his scientific method reveals that his reasoning was far from irrational." (Duck, Michael; "The Bezold-Bruecke Phenomenon and Goethe's Rejection of Newton's Opticks," American Journal of Physics, 55:793, 1987.) Comment. Goethe just did not see what Newton saw, and their feud was rather bitter. To illustrate, Goethe considered the subjective aspects of his optical experiments, while Newton neglected them. For example, in the Bezold-Bruecke phenomenon, reds became yellower with increasing brightness -- or seem to with human observers. Goethe's theory of color took such effects into account. Once again, one person's reality can be different from another's . From Science Frontiers #55, JAN-FEB 1988 . 1988-2000 William ...
Terms matched: 1 - Score: 65 - 15 May 2017 - URL: /sf055/sf055p20.htm
... light: sea of fire It has always been perplexing that scientists have made no concerted effort to find the cause of the many forms of the geometrical luminescent displays seen in the Persian Gulf, the Indian Ocean, and other warm waters. True, a few individual researchers have looked at literature and done some theorizing; but no expeditions have been launched that we know of. Here is a well-verified, richly complex, eerily beautiful, natural phenomenon that is almost completely neglected by science. Happily, P. Huyghe has now brought the problem to the fore in a comprehensive article in Oceans, He reviews several types of luminescent displays and some of the theories-of-origin that have been proposed. We have space here for only one of the observations he records. P. Newton was the Chief Officer on the M.V . Mahsuri, which was passing through the Gulf of Oman bound for Australia. It was a dark, moonless night in May. "Then it happened. What first caught Newton's attention was a pale green glow on the horizon just ahead of the ship, but he said nothing to the cadet standing watch with him. Moments later, parallel bands of bluegreen light began to sweep silently over the water toward the ship from the southeast. Still, Newton said not a word, but he felt as if he should duck. Each light band was about 10 to 15 feet wide and at least 500 feet long, and appeared to be some 15 feet above the water. They came rapidly -- every four or five seconds ...
Terms matched: 1 - Score: 53 - 15 May 2017 - URL: /sf055/sf055p14.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 Exorcising The Hidden Mass These days the astronomical publications are full of discussions of the "missing mass" problem. It seems that for galax-ies to move the way they do, there has to be some "dark matter" out there, assuming Newton's Laws of Gravitation and Motion are valid. Something unseen is tugging on galaxies and the stars that comprise them. This is a sad situation, according to Moto Milgrom, an Israeli astrophysicist. Maybe there is nothing hidden and Newton's Law of Gravitation is wrong. After all, it was derived solely on the basis of solar-system observations. On a larger scale, it might be incorrect. Milgrom offers a startling alternative: for accelerations greater than a , let Newton's Law be; below that value, let the square of the acceleration be proportional to the mass of the attracting body and the inverse square of the distance. This done and presto the need for missing mass disappears. Even more remarkable is the fact that a particle with the acceleration a just reaches the speed of light over the age of the universe. (Milgrom, Moto; "Newtonian Gravity Falls Down," New Scientist, p. 45, March 7, 1985.) Comment. It would be more than passing strange for cosmic laws to suddenly shift gears so radically at a specific value of acceleration. Reference. The "missing mass" problem is covered ...
Terms matched: 1 - Score: 39 - 15 May 2017 - URL: /sf039/sf039p04.htm
... Science Frontiers ONLINE No. 58: Jul-Aug 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Chaotic Dynamics In The Solar System The following abstract appeared in a 1988 issue of Eos, a weekly publication of the American Geophysical Union. "Newton's equations have chaotic solutions as well as regular solutions. The solar system is generally perceived as evolving with clockwork regularity, yet there are several physical situations in the solar system where chaotic solutions of Newton's equations play an important role. There are physical examples of both chaotic rotation and chaotic orbital evolution. "Saturn's satellite Hyperion is currently tumbling chaotically, its rotation and spin axis orientation undergo significant irregular variations on a time scale of only a couple of orbit periods. Many other satellites in the solar system have had chaotic rotations in the past. It is not possible to tidally evolve into a synchronous rotation without passing through a chaotic zone. For irregularly shaped satellites this chaotic zone is attitude-unstable and chaotic tumbling ensues. This episode of chaotic tumbling probably lasts on the order of the tidal despinning timescale. For example, the Martian satellites Phobos and Deimos tumbled before they were captured into synchronous rotation for a time interval on the order of 10 million years and 100 million years, respectively. This episode of chaotic tumbling could have had a significant effect on the orbital histories of these satellites." Theis abstract continues, naming as other candidates for chaotic histories: some of the asteroids, Miranda (a satellite of Uranus), and the planet Pluto. ...
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... ' a Galaxy," Baltimore Sun, p. 8A, June 8, 1993.) The dark matter surrounding a galaxy will, according to the Theory of Relativity, act as a gravitational lens that will deflect light rays passing near it. This dark matter, acting like a telescope, should increase the number of quasars counted in the sky near galactic clusters. Such larger quasar counts are indeed observed, but these increases are much larger than expected. The implication is that there is much more dark matter in the universe than previously thought. (Cowen, Ron; "Quasar Count Poses Dark-Matter Puzzle," Science News, 143:397, 1993.) Finally, dark matter is forcing scientists to reexamine the Equivalence Principle, which asserts that gravitational mass (as in Newton's Law of Gravitation) is identical to inertial mass (as in Newton's Force = Mass X Acceleration). In terrestrial experiments, the two kinds of mass are equal, but on a cosmological scale, they may not be. There could be an extra, small (10%), longrange, non-gravitational force exerted between massive objects. (Frieman, Joshua A., and Gradwohl, Ben-Ami; "Dark Matter and the Equivalence Principle," Science, 260:1441, 1993.) Reference. "Dark matter" or "missing mass" is cataloged in AWB5 in our book: Stars, Galaxies, Cosmos. Details of this book may be seen here . From Science Frontiers #89, SEP-OCT 1993 . 1993- ...
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... 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 The Spheres Can Dance To Convoluted Music A lot has been written about the "music of the spheres." But we don't hear much about this celestial music anymore; rather, "dances of the spheres" are in vogue. If only gravity and Newton's Laws ruled celestial motion, there would be no general solution to the hoary "three-body problem. But in the three special configurations illustrated, three bodies of equal mass can be shown to be stable. The third, the figure-of-eight, was not discovered until 1993 by C. Moore. Although mathematicians can prove it is stable, R. Montgomery admits: There is no understanding of why the orbit is stable, from either a physical or mathematical point of view. Certainly no figure-eight orbits have ever been observed in the cosmos so far, but who knows?. The situation becomes really bizarre when more than three equal masses are considered. A few of the many stable, but manifestly weird, configurations are also illustrated here. These are among the simplest. To illustrate, C. Simo has found a stable choreography for 799 bodies cavorting happily and stably together in space. And he was using only his laptop! (Appell, David; "Celestial Swingers," New Scientist, p. 36, August 4, 2001.) From Science Frontiers #139, Jan-Feb 2002 . 2001 William ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf139/sf139p02.htm
... Science Frontiers ONLINE No. 33: May-Jun 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects High g-values in mines Measurements of G, the constant in Newton's Law of Gravitation, made in mines are always significantly higher than those made in surface laboratories. No one is quite sure why. It has been suggested that a lack of knowledge of the densities of surrounding rocks might account for this discrepancy. But Holding and Tuck report new measurements in Australian mines, where the densities are very well known. The G values are still high. Mine measurements of G differ in the fact that the masses employed can be much farther apart. (Holding, S.C ., and Tuck, G.J .; "A New Mind Determination of the Newtonian Gravitational Constant," Nature, 307:714, 1984.) From Science Frontiers #33, MAY-JUN 1984 . 1984-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 62: Mar-Apr 1989 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology The cup-and-ring motif in america Vikings in south america? Astronomy THE "RESIDUE FALLACY" DOES NOT APPLY TO ALL RESIDUES! RECENT MARTIAN RIVERS ERODE ALBA PATERA Dancing to the comets' tune Biology Measles epidemics: noisy or chaotic? A MAMMOTH TALE! A HAIR-RAISING PHENOMENON Geology THE COOKIE CUTTER STRIKES AGAIN -- FOUR TIMES - IN NORWAY Geophysics Visual sightings of vortices in britain WHAT IS EXPLODING 400 MILES BENEATH OUR FEET? Psychology Researches in reincarnation Physics MORE CHALLENGES TO NEWTON'S LAW OF GRAVITATION ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf062/index.htm
... Science Frontiers ONLINE No. 50: Mar-Apr 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects On The Trail Of The Fifth Force Well publicized lately has been the modern reanalysis of the old Eotvos balance experiments. Some think they show the presence of that famous "fifth force" which is supposed, according to some theories, to modify Newton's Law of Gravitation, and become measurable at distances of about 100 to 1000 meters. The Eotvos results may also be explicable in terms of laboratory air currents. But the fifth force may be showing up in geophysical experiments. "One of the most comprehensive geophysical experiments so far has been conducted by Frank Stacey at University of Queensland in Brisbane, Australia, and his colleagues. Working in two metal mines, the researchers have measured a gravitational constant that is 0.7 percent greater than that measured in the laboratory -- suggesting the presence of a fifth force." (Weisburd, Stefi; "Geophysics on the Fifth Force's Trail," Science News, 131: 6, 1987.) From Science Frontiers #50, MAR-APR 1987 . 1987-2000 William R. Corliss ...
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... 116: Mar-Apr 1998 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects G: The Embarrassing Constant Of Nature Of the four fundamental forces of nature, gravity was the first to be discovered. Even the Neanderthals knew of it! That's hardly surprising; it's everywhere. Unfortunately, we don't know much more about it than the Neanderthals. Though it seems powerful when you trip and fall, gravity is the weakest of the fundamental four. In a helium nucleus, the force of repulsion between two protons is 1040 times the gravitational attraction between them. Weak though it may be, gravity controls the trajectory of a baseball, the motion of the planets, and the shape of our Galaxy. Physicists describe gravitation with Newton's Law of Gravitation, which incorporates the Gravitational Constant G. Here's where the embarrassment arises. Many other constants of nature, such as the charge on the electron, are known to eight significant figures. We only know G to three. What's worse, modern attempts to refine the measurement of G come up with wildly different answers. Torsion-pendulum experiments in the U.S ., Germany, and New Zealand are far apart in their G-measurements. And physicists are perplexed -- to put it mildly. Of course, G is hard to measure. Seismic waves from ocean surf hundreds of miles away can affect the experiments. If a colleague a few offices away brings in some boxes of books for his library, the experiment is compromised ...
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... weightless! This recipe is based on a claim by Finnish scientist E.E . Podkletnov at the Tampere University of Technology. Podkletnov discovered this amazing effect when researching superconducting materials, However, he used only a single ring, which resulted in a 2% weight reduction. Since antigravity effects are probably additive, it seems reasonable that fifty rings will create a 100% weight reduction. Obviously, more than fifty rings will be required to launch spacecraft from earth! Sure, it's a wild claim, but NASA is checking it out at the University of Alabama in a project headed by N. Li. (Holden, Constance; "NASA's Fling with Antigravity," Science, 274:183, 1996. Also: Port, Otis; "Take That, Isaac Newton," Business Week , p. 42, September 30, 1996. Cr. E. Murphy.) Comment. Facetiousness aside, it is pertinent to add here that physicist P.M .S . Blackett once seriously hypothesized that a magnetic field is generated by a rotating mass, such as the sun. From Science Frontiers #114, NOV-DEC 1997 . 1997-2000 William R. Corliss ...
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... these laws in a like manner. No such luck! Doppler measurements of galaxy rotations made by Vera C. Rubin and her colleagues, at the Carnegie Institution, indicate that most stars out near the galactic rims rotate just as fast or faster than those closer to the hub. Astronomers suppose that this anomalous rotation may be due to halos of undetected burntout stars and/or gas fringing the galaxies. Such halos would dis-tort the inverse-square-law field, permitting the observed anomalous rotation. (Anonymous; "Fast-Spinning Galaxies," Science Digest, 89:18, November 1981.) Comment. No one has yet discovered these hypothetical halos of mass. The universe seems to be full of "missing mass." An unpopular alternative would be the admission that Newton's Law of Gravitation does not hold on the galactic scale. From Science Frontiers #19, JAN-FEB 1982 . 1982-2000 William R. Corliss ...
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... X * Meteorite geographical anomalies * Meteorites from the moon * Long fireball processions * Very long duration meteorites * Zodiacal light brightness changes * [Picture caption: One of the many possible modes of solar surface oscillation] Comments from reviews: "It is an unusual book, nicely executed, and I recommend it highly", Icarus. 288 pages, hardcover, $17.95, 66 illustrations,4 indexes 1986. 874 references, LC 86-60231, ISBN 915554-20-8 , 7x10 format. Stars, Galaxies, Cosmos: A Catalog of Astronomical Anomalies Sorry: Out of Print. No longer available. Did the Big Bang really begin the existence of all we know? Do we honestly know how the stars (and our sun) work? Can we rely on Newton's Law of Gravitation? According to this volume the answer seems to be "Probably not ! " Typical subjects covered: Optical bursters and flare stars * Estorical color change of Sirius * Infrared cirrus clouds * Quasar-galaxy associations * The red-shift controversy * Quantization of red shifts * The quasar energy paradox * Apparent faster-than-light velocities in quasars and galaxies * Evidence for universal rotation * Swiss cheese structure of universe * Is the "missing mass" really missing ? * Superluminous infrared galaxies * Shells around elliptical galaxies Comments from reviews: ". .. it never fails to be interesting, challenging and stimulating", New Scientist 246 pages, hardcover, $17.95, 50 illustrations, 4 indexes 1987. 817 references, LC 87-60007, ...
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