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Directed Panspermia Using Interstellar Comets
Christopher P McKay1, Paul C W Davies2, Simon P Worden3
1Space Science Division, NASA Ames Research Center, Moffett Field, California, USA.
Astrobiology
|December 8, 2022
Summary
Habitable planets may be common, but life rare. This study proposes using interstellar comets to seed lifeless planets with life, exploring panspermia and ethical challenges.
Area of Science:
- Astrobiology
- Planetary Science
- Exoplanet Research
Background:
- Habitable exoplanets may be common, yet life's prevalence remains unknown.
- Future telescope advancements might reveal a universe rich in planets but devoid of life.
- This scarcity could motivate proactive measures to introduce life beyond Earth.
Purpose of the Study:
- To propose a novel mechanism for seeding lifeless planets with terrestrial or synthetic life.
- To explore the feasibility of using interstellar comets for interplanetary microbial transport.
- To consider the implications of panspermia, both natural and deliberate, for understanding life's origins.
Main Methods:
- Conceptualizing interstellar comets as natural delivery vehicles for microbial payloads.
- Investigating the potential for cometary dust trails to disseminate life across planetary systems.
- Analyzing the scientific and ethical considerations of directed panspermia.
Main Results:
- Interstellar comets offer a cost-effective method for transporting microbial life to exoplanets.
- Cometary dust trails could serve as a natural mechanism for spreading life.
- The hypothesis of life's deliberate seeding could be tested by searching for specific biochemical signatures.
Conclusions:
- Seeding lifeless planets is a potential future endeavor if life proves rare.
- Interstellar comets present a viable, low-cost mechanism for interplanetary life transfer.
- Further research is required to address the significant ethical and technological challenges involved.
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