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Evidence for Past Life on Early Mars: How the Evidence Stands

  • Everett K. Gibson (a1), Kathie L. Thomas-Keprta (a2), Simon J. Clemett (a2), David S. Mckay (a1), Christopher Romanek (a3) and Susan J. Wentworth (a2)...

Abstract

Martian Meteorite ALH84001 contains four unusual features which have been interpreted as possible signatures of relic biogenic activity. After six years of intense study by the world's scientific community, the current status of the biogenic hypothesis is reviewed and shown to still be valid. Furthermore additional features have been observed in two younger Martian meteorites. The strongest argument for possible evidence of biogenic activity within the ALH84001 meteorite is the presence of truncated hexa-octahedral magnetite crystals which are only known on Earth to be the products of biology.

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