Extraterrestrial Life & the Fermi Paradox
Zoo Hypothesis
Proposes that extraterrestrial civilizations exist and are aware of humanity, but deliberately avoid contact, treating Earth and its life as a protected, unperturbed reserve.
Proponents
John A. Ball
Evidence For
Consistent with observed silence without requiring life or intelligence to be intrinsically rare.
Evidence Against
Requires near-universal, indefinitely sustained cooperation among every extraterrestrial civilization to maintain the same non-interference policy, which critics find implausible.
Real Sources
Transmissions
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