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Moving Beyond Definitions in the Search for Extraterrestrial Life.

Carol E Cleland1

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This summary is machine-generated.

Searching for extraterrestrial life may be more successful by looking for unexplained anomalies rather than attempting to define life. This approach helps identify novel life forms that might otherwise be overlooked.

Keywords:
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Area of Science:

  • Astrobiology
  • Search for extraterrestrial life
  • Origin of life

Background:

  • A central goal in astrobiology is defining life, yet no consensus exists.
  • Current strategies for detecting extraterrestrial life may overlook novel life forms.
  • Scientific discovery is often driven by anomalies that challenge existing theories.

Purpose of the Study:

  • To propose an alternative strategy for searching for extraterrestrial life.
  • To advocate for searching for potentially biological anomalies using tentative criteria.
  • To increase the likelihood of detecting novel life forms.

Main Methods:

  • Focus on identifying phenomena that resist classification as living or nonliving.
  • Utilize tentative criteria rather than strict definitions of life.
  • Employ a variety of lines of evidence (biosignatures) for investigation.

Main Results:

  • The proposed strategy can identify phenomena worthy of further investigation for novel life.
  • This approach is as effective as definition-based strategies for detecting familiar life.
  • It offers a higher likelihood of noticing truly novel life forms.

Conclusions:

  • Searching for anomalies with tentative criteria is a viable alternative to defining life for astrobiology.
  • This strategy enhances the discovery of novel extraterrestrial life.
  • Anomalies, when investigated, can drive significant scientific advancements.