Finding a second sample of life on earth

Paul Davies, Charles H. Lineweaver

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

If life emerges readily under Earth-like conditions, the possibility arises of multiple terrestrial genesis events. We seek to quantify the probability of this scenario using estimates of the Archean bombardment rate and the fact that life established itself fairly rapidly on Earth once conditions became favorable. We find a significant likelihood that at least one more sample of life, referred to here as alien life, may have emerged on Earth, and could have co-existed with known life. Indeed, it is difficult to rule out the possibility of extant alien life. We offer some suggestions for how an alternative sample of life might be detected.

Original languageEnglish (US)
Pages (from-to)154-163
Number of pages10
JournalAstrobiology
Volume5
Issue number2
DOIs
StatePublished - Apr 2005
Externally publishedYes

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sampling
suggestion
bombardment
Archean
estimates
rate

Keywords

  • Biogenesis
  • Impact frustration
  • Origin of life

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Finding a second sample of life on earth. / Davies, Paul; Lineweaver, Charles H.

In: Astrobiology, Vol. 5, No. 2, 04.2005, p. 154-163.

Research output: Contribution to journalArticle

Davies, Paul ; Lineweaver, Charles H. / Finding a second sample of life on earth. In: Astrobiology. 2005 ; Vol. 5, No. 2. pp. 154-163.
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