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Finding a second sample of life on earth.

P C W Davies1, Charles H Lineweaver

  • 1Australian Centre for Astrobiology, Macquarie University, New South Wales, Australia.

Astrobiology
|April 9, 2005
PubMed
Summary

Multiple origins of life on Earth are probable. This study suggests alien life may have emerged and potentially still exists, offering detection methods.

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Area of Science:

  • Astrobiology
  • Origin of Life Studies
  • Planetary Science

Background:

  • Life on Earth emerged rapidly once conditions became favorable.
  • Earth's early history involved significant bombardment events.
  • The conditions for abiogenesis may not be unique to Earth.

Purpose of the Study:

  • To quantify the probability of multiple independent life origins on Earth.
  • To assess the likelihood of 'alien life' coexisting with known terrestrial life.
  • To explore the possibility of extant alien life on Earth.

Main Methods:

  • Utilized estimates of the Archean bombardment rate.
  • Incorporated the rapid establishment of life on early Earth.
  • Developed a probabilistic framework for multiple abiogenesis events.

Main Results:

  • A significant likelihood exists for at least one additional terrestrial genesis event.
  • The emergence of an alternative 'alien' life sample on Earth is plausible.
  • The possibility of extant alien life cannot be discounted.

Conclusions:

  • Multiple origins of life on Earth are a statistically significant possibility.
  • Further research should focus on detecting alternative life forms.
  • Suggestions for detecting extant or extinct alien life are provided.

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