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The deep, hot biosphere.

T Gold1

  • 1Cornell University, Ithaca, NY 14853.

Proceedings of the National Academy of Sciences of the United States of America
|July 1, 1992
PubMed
Summary
This summary is machine-generated.

Deep Earth microbial life, independent of sunlight, thrives on chemical energy. This widespread subsurface biosphere may exist on other planets and throughout the universe.

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Area of Science:

  • Astrobiology
  • Geomicrobiology
  • Planetary Science

Background:

  • Microbial life is increasingly found in Earth's deep crust and ocean vents.
  • This life utilizes chemical energy sources, independent of solar energy and photosynthesis.

Purpose of the Study:

  • To explore the implications of widespread subsurface microbial life.
  • To consider the potential for similar life on other celestial bodies.

Main Methods:

  • Review of existing data on deep subsurface microbial ecosystems.
  • Comparative analysis of planetary conditions for subsurface habitability.

Main Results:

  • Subsurface microbial life may be comparable in mass to surface life.

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  • It can explain biological molecules in carbonaceous materials, challenging surface-origin assumptions.
  • Suitable subsurface conditions exist on many planetary bodies.

    • Conclusions:

    • Earth's deep biosphere is a significant, underappreciated component of life.
    • Subsurface life is a plausible widespread phenomenon in the solar system and beyond.
    • The search for extraterrestrial life should consider subsurface environments.