Does life's rapid appearance imply a Martian origin?

Details Does life's rapid appearance imply a Martian origin? Does life's rapid appearance imply a Martian origin?

2004-03-02

arxiv.org/abs/astro-ph/0403049v1

Astrobiology 3 (2003) 673

Astronomy and Astrophysics

Astrophysics

10 pages, no figures, research paper

Scientific paper

10.1089/153110703322736006

The hypothesis that the rapid appearance of life on Earth justifies the belief that life is widespread in the universe has been investigated statistically by Lineweaver and Davis. However, a rapid appearance could also be interpreted as evidence for a nonterrestrial origin. I attempt to quantify the relative probabilities for a nonindigenous versus an indigenous origin of life on Earth, on the assumption that biogenesis involved one or more highly improbable steps, using a generalization of the well known observer selection argument of Carter. The analysis is specifically applied to a Martian origin of life, with subsequent transfer to Earth within impact ejecta.

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