Extraterrestrial life: life on Mars--then and now.
The recent claim to have discovered evidence of extraterrestrial life on a meteorite from Mars is not compelling, but the study nevertheless has useful heuristic value.
Arrhenius
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Scripps Institution of Oceanography, University of California, San Diego, La Jolla 92093-0220, USA.
Mojzsis
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D018559:Exobiology; D005580:Fossils; D018535:Mars; D019110:Meteoroids