10 results found.
... 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: 57 - 15 May 2017 - URL: /sf099/sf099g10.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 Can spores survive in interstellar space?There is good evidence that life appeared on earth just 200-400 million years after the crust had cooled (assuming conventional methods of measuring age). Two hundred million years seems a bit on the short side for the spontaneous generation of life, although no one really knows just how long this process should take (forever?). The apparent rapidity of the onset of terrestrial life has led to a reexamination of the old panspermia hypothesis, in which spores, bacteria, or even nonliving "templates" of life descended on the lifeless but fertile earth from interstellar space. P. Weber and J.M . Greenberg have now tested spores (actually Bacillus subtilis) under temperature and ultraviolet radiation levels expected in interstellar space. They found that 90% of the spores under test would be killed in times on the order of hundreds of years -- far too short for panspermia to work at interstellar distances. However, if the spores are transported in dark, molecular clouds, which are not uncommon between the stars, survival times of tens or hundreds of million years are indicated by the experiments. Under such conditions, the interstellar transportation of life is possible. But perhaps the injection and capture phases of panspermia might be lethal to spores. Weber and Greenberg think not -- under certain conditions. The collision of a large comet or meteorite could inject spores from a life-endowed planet ...
Terms matched: 1 - Score: 55 - 15 May 2017 - URL: /sf042/sf042p11.htm
... Science Frontiers ONLINE No. 21: May-Jun 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Artificial Panspermia On The Moon A colony of earth bacteria, Streptococcus mitis, apparently survived on the moon's surface between April 1967 and November 1969. The organisms were discovered in a piece of insulating foam in the TV camera retrieved from Surveyor 3 by Apollo astronauts. (Anonymous; Science Digest, 90:19, April 1982.) From Science Frontiers #21, MAY-JUN 1982 . 1982-2000 William R. Corliss ...
Terms matched: 1 - Score: 52 - 15 May 2017 - URL: /sf021/sf021p09.htm
... Science Frontiers ONLINE No. 99: May-Jun 1995 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology The inscribed bricks of comalcalco Ancient modern life and carbon dating Traces of the southern flotilla Astronomy Where have all the black holes gone? Ltps and ets Biology Curious brain asymmetries Did darwin get it all right? When scents make no sense Biological precursors of the 1995 kobe earthquake Geology Ballistic panspermia Geophysics Warning cars rolling uphill ahead 90-DAY SEA-LEVEL OSCILLATION AT WAKE ISLAND Luminous precursors of the 1995 kobe earthquake Psychology The untapped human mind Physics Why does spaghetti break into three pieces instead of two? ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf099/index.htm
... Science Frontiers ONLINE No. 32: Mar-Apr 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Spores still viable after 7,000 years Bacterial spores embedded in muds lining Minnesota's Elk Lake -- the muds were carbon-dated at 7518 years(!) -- grew vigorously when placed in a nutrient-rich solution. (Anonymous; "Spores Still Viable after 7,000 Years," Science News, 124:280, 1983.) Comment. Such long periods of suspended animation support the panspermia concept, which states that life can be transported through outer space on meteorites and other debris. From Science Frontiers #32, MAR-APR 1984 . 1984-2000 William R. Corliss ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf032/sf032p08.htm
... Science Frontiers ONLINE No. 21: May-Jun 1982 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Strange Megalithic Monuments in the Central Sahara The Hueyatlaco Dilemma More on Those Chinese Anchors in California Waters Astronomy The Earth's Other Moons Flattened Sun Means Trouble for Einstein Natural Lasers in the Terrestrial and Martian Skies? Magnetic Tune Played on Saturn's Rings Biology Don't Build Von Neumann Machines Artificial Panspermia on the Moon Geology Bull's Eye Pattern of Magnetic Anomalies What's Ok in the Mediterranean is Verboten in the Atlantic and the Pacific Geophysics Anomalous Sky Flash Psychology Oh Magic, Thy Name is Psi ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf021/index.htm
... . "However some scientists have not dismissed the possibility that primitive life may still exist on Mars. 'The chances are remote but life may be located in slushy brines well below the surface, or even inside Martian rocks,' said Howard Klein, who headed the biological experiments on board Viking. Living microorganisms have been found just below the surface of rocks in Antarctica, Klein said." (Anonymous; Antarctica Hints at Why There May Be Fossils on Mars," New Scientist, p. 20, September 4, 1986.) Comment. It is curious that some of the meteorites picked up in Antarctica are thought to have originated on Mars and been blasted off by meteoric impacts. This observation leads to the speculation that terrestrial life might have been seeded from Mars -- meteoric panspermia! Are we all Martians? If you have hung on this far, you'll want to read about "Life as a Cosmic Phenomenon" just below. Also refer to our catalog: The Sun and Solar System Debris for material on the putative Martian meteorites. From Science Frontiers #48, NOV-DEC 1986 . 1986-2000 William R. Corliss ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /sf048/sf048p04.htm
... the question of whether large impacts on Earth may eject rocks that could fall on Mars (or other planets in the Solar System) and, if so whether they might contain spores or some sort of viable microorganisms that would have the opportunity to colonize Mars." After some computations Melosh concludes: "It seems likely that the impacts that produced craters on Earth that are greater than 100 km in diameter would each have ejected millions of tons of near-surface rocks carrying viable microorganisms into interplanetary space, much in the form of boulders large enough to shield those organisms from ultraviolet radiation, low-energy cosmic rays, and even galactic cosmic rays. Under such circumstances spores might remain viable for long periods of time." (Melosh, H.J .; "The Rocky Road to Panspermia," Nature, 332:687, 1988.) Comment. Next we need a reasonable mechanism that spreads life through interstellar space. Light pressure, that's it; and the idea is over a century old! Incidentally, SNC is short for Shergottites, Nakhalites, Chassignites; all rare classes of meteorites. From Science Frontiers #58, JUL-AUG 1988 . 1988-2000 William R. Corliss ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /sf058/sf058a03.htm
... they become extinct. This striking aspect of the fossil record is not predicted by neo-Darwinism -- and there is the rub! (Williamson, Peter G.; "Morphological Stasis and Developmental Constraint: Real Problems for Neo-Darwinism," Nature, 294:214, 1981.) Comment. In neo-Darwinism, evolution unfolds by small accumulated changes, the causes of which may be chemicals in the environment, nuclear radiation, and other "stresses." Neo-Darwinism goes hand-in-hand with geological Uniformitarianism, both of which are favored philosophically by scientists because slow change is more amenable to scientific explanation. The large sidewise steps of punctuated evolution are difficult to explain in terms of known "forces." In this context, the radical concepts of directed panspermia and the impact of viruses on evolution may be important! From Science Frontiers #19, JAN-FEB 1982 . 1982-2000 William R. Corliss ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /sf019/sf019p06.htm
... the number of trial assemblies of amino acids that are needed to give rise to the enzymes, the probability of their discovery by random shufflings turns out to be less than 1 in 1040000." They conclude that the genes that control the development of terrestrial life must have evolved on a cosmic scale, where there has been more time and much more room for shufflings. (Hoyle, Fred, and Wickramasinghe, Chandra; "Where Microbes Boldly Went," New Scientist, 91:412, 1981.) Comment. Could not the "new" bacteria that appeared in the Mt. St. Helens area, as described in LIFE'S ORIGIN WITHIN THE EARTH? , have drifted down through the atmosphere into the lakes and ponds -- a sort of modern, ever-continuing panspermia? It is interesting to note here that even Hoyle, who has espoused the Steady State theory of the cosmos, seems to require the creation of life followed by evolution. This need for an origin of life is a human philosophical weakness. In principle, matter and life, too, could have always existed. From Science Frontiers #18, NOV-DEC 1981 . 1981-2000 William R. Corliss ...
Terms matched: 1 - Score: 13 - 15 May 2017 - URL: /sf018/sf018p07.htm
