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Transfer of Rocks Between Planetary Systems: Panspermia Revisited.

Fred C Adams1,2, Kevin J Napier1

  • 1Department of Physics and University of Michigan, Ann Arbor, Michigan, USA.

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|December 8, 2022
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Summary
This summary is machine-generated.

Interstellar objects may transfer life-bearing rocks between star systems. While transfer rates are higher in stellar birth clusters, the overall probability of successful panspermia remains low.

Keywords:
Dynamical evolutionKuiper beltOort cloud. Astrobiology 22, 1429–1442Small solar system bodiesSolar system

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Area of Science:

  • Astrobiology
  • Planetary Science
  • Dynamical Astronomy

Background:

  • Recent discovery of interstellar objects highlights potential for interplanetary transfer.
  • Advancements in dynamical simulations enable quantitative analysis of panspermia.

Purpose of the Study:

  • To re-evaluate the likelihood of lithopanspermia (transfer of life via rocks) between planetary systems.
  • To estimate astronomical factors influencing the interplanetary transfer of life-bearing rocks.

Main Methods:

  • Estimation of astronomical parameters: rock capture cross sections, ejecta velocity distributions, survival times.
  • Analysis of solar system dynamics within birth clusters and interstellar space.
  • Integration of biological probabilities for life's origin and seeding efficiency.

Main Results:

  • Interplanetary transfer rates are enhanced within stellar birth clusters.
  • The overall probability for successful panspermia is currently too low to be considered likely.
  • A substantial inventory of alien rocks is predicted within the solar system, mostly non-biological.

Conclusions:

  • While astronomical transfer is possible, biological uncertainties limit the likelihood of panspermia.
  • The solar system likely contains numerous non-biological interstellar objects.
  • Further research into biological probabilities is crucial for a complete understanding of panspermia.