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Exponential evolution: implications for intelligent extraterrestrial life.

D A Russell1

  • 1Paleobiology Division, National Museum of Natural Sciences, Ottawa, Canada.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|January 1, 1983
PubMed
Summary
This summary is machine-generated.

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Biological complexity, like brain development, grows exponentially over time. This suggests advanced life could evolve elsewhere, potentially becoming common in the universe soon.

Area of Science:

  • Astrobiology
  • Evolutionary Biology
  • Cosmology

Background:

  • Biologic complexity, including brain development, exhibits exponential growth over geological timescales (10^6–10^9 years).
  • Evolutionary processes are influenced by biological interactions and constrained by physical conditions, determining the pace of complexity development.

Purpose of the Study:

  • To estimate the prevalence of life at various complexity levels in the Galaxy.
  • To explore the implications of evolutionary trends for the future prevalence of advanced life.

Main Methods:

  • Analyzing trends in biological complexity and brain evolution on Earth.
  • Applying modified Drake Equation terms (number and longevity of civilizations) to cosmic estimations.

Main Results:

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  • Earth's evolutionary trends suggest other organisms could reach human-level complexity within approximately 10^7 years.
  • Exponential evolutionary processes imply that higher intelligence may become more prevalent in the universe within 10^9 years.

Conclusions:

  • Cosmic life, if present, may evolve towards higher intelligence exponentially.
  • Biological complexity's evolution may be most rapid in later universal times, creating symmetry with early universal times.