Read e-book online Lectures in Astrobiology: Vol I (Advances in Astrobiology PDF

By Muriel Gargaud

First complete, starting graduate point publication at the emergent technology of astrobiology.

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Extra info for Lectures in Astrobiology: Vol I (Advances in Astrobiology and Biogeophysics)

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From the Origin of Life on Earth to Life in the Universe 15 If Europa maintained tidal and/or hydrothermal activity in its subsurface until now, it is possible that bacterial activity is still present. Thus, the possibility of an extraterrestrial life present in a subsurface ocean of Europa must be seriously considered. The most likely sites for extant life would be at hydrothermal vents below the most recently resurfaced area. To study this directly would require making a borehole through the ice in order to deploy a robotic submersible.

Q. (2000). Natural transfer of viable microbes in space, Part 1: From Mars to Earth and Earth to Mars. Icarus, 145, 391–427. L. (1953). The production of amino acids under possible primitive Earth conditions. Science, 117, 528–529. L. L. (1988). Submarine hot springs and the origin of life. Nature, 334, 609–611. L. (1996). Evidence for life on Earth before 3800 million years ago. Nature, 384, 55–59. M. (2002). Amino acids from ultraviolet irradiation of interstellar ice analogues. Nature, 416, 403–405.

However, no such sedimentary material has been found in any SNC meteorite. It is possible that they did survive the effects of the escape acceleration from the Martian surface but did not survive terrestrial atmospheric entry because of decrepitation of the cementing mineral. The ‘STONE’ experiment, flown by ESA, was designed to study precisely such physical and chemical modifications to sedimentary rocks during atmospheric entry from space. A piece of basalt (representing a standard meteoritic material), a piece of dolomite (sedimentary rock) and an artificial Martian regolith material (80% crushed basalt and 20% gypsum) were embedded into the ablative heat shield of Foton 12, which was launched on September 9 and landed on September 24, 1999.

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