Extraterrestrial Life & the Fermi Paradox
Directed Panspermia
Proposes that life on Earth was deliberately seeded by an earlier advanced civilization, rather than arising locally through abiogenesis or arriving by chance via natural panspermia.
Proponents
Francis Crick, Leslie Orgel
Evidence For
Technically feasible in principle for a sufficiently advanced civilization, by its proponents' own calculations at the time.
Evidence Against
Unfalsifiable and unnecessary as an explanation, since natural abiogenesis and undirected panspermia remain viable, simpler, and untested-against hypotheses for the same evidence.
Real Sources
Transmissions
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