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... 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: 168 - 15 May 2017 - URL: /sf078/sf078a05.htm
... Science Frontiers ONLINE No. 129: MAY-JUN 2000 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Extremophilic Terraforming of Mars If we are to colonize Mars, we must make it more earthlike; and that is what terraforming does. Right now, the Martian atmosphere, surface temperatures, level of ionizing radiation, and noxious soil are inimical to delicate, complex life forms, such as us. But these hostile Martian conditions are easily endured by some bacteria, such as Deinococcus radiodurans . This bacterium, one of the extremophiles, lives in our sewage systems and other unpleasant places. It can survive desiccation, freeze-drying, and high radiation levels. D. radiodurans can do more than survive on Mars. It can begin to detoxify the soil and prepare the way for other pioneer microorganisms. And even more: What D. radiodurans can provide is a microscopic (and therefore easily portable) factory -- a kind of terra-forming toolkit -- from which any number of products potentially can be derived. Whether it is engineered to reduce metals, produce drugs for ailing astronauts or simply manufacture the polymers necessary for the production of thread, D. radiodurans , one of the world's oldest bacteria, may provide a means of expanding the limits of human imagination beyond the written sci-fi page. (Slotnick, Rebecca Sloan; "Extremophilic Terraforming," American Scientist, 88: 124, 2000.) Comment. Perhaps D. radiodurans is the oldest bacterium on earth. Having arrived eons ago on ...
Terms matched: 1 - Score: 145 - 15 May 2017 - URL: /sf129/sf129p03.htm
... Science Frontiers ONLINE No. 78: Nov-Dec 1991 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology CURIOUS SILVER CROSSES FROM A GEORGIA MOUND Who was manufacturing what? Marcahuasi: a mystery in stone Astronomy METEOROID IMPACTS: THE OTHER SIDE OF THE STORY Terraforming mars Biology Fossil identity still up in the air Kamikaze sperm More light, more fight Why do flamingos stand on one leg? Geology HEAVY BOMBARDMENT OF SOUTHEAST ASIA 700,000 YEARS AGO TUNGUSKA-LIKE EVENT IN NEW ZEALAND 800 YEARS AGO? Degruyerizing switzerland Geophysics RADAR INTERFERENCE AND LUMINESCENCE LUNAR RAINBOW AND UNEXPLAINED WHITE ARC CROP CIRCLES: HOAXES OR NATURAL PHENOMENA? Psychology Psychokinetic control of dice ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf078/index.htm
... Science Frontiers ONLINE No. 129, May-Jun 2000 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Leif was Late The Hidden "Gardens" Astronomy TLPs: One Fades, Others Flash The Extremophilic Terraforming of Mars Interplanetary Doldrum s Biology Why we "Roll in the Aisles" If Fingerprints Don't Lie, Neither to Toe Prints A Third Way? Geology Leaky Seas From Nature's Atelier The Anomalous Antiquity of Some Landforms Geophysics Crop Circles Can be Natural Contagious St. Elmo's Fire Uplifting may be Hazardous Psychology The Sound of Shapes Miscellaneous An Astronomer's UFO nnnbbbbbvccccccxzzzzzcvbn,;/////ppooo ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf129/index.htm
