Zoo Hypothesis

CORE DEFINITION

The Zoo Hypothesis speculates on the assumed behavior and existence of technologically advanced extraterrestrial life and the reasons they avoid contact with Earth. It is one of many theoretical explanations for the Fermi Paradox. The hypothesis states that extraterrestrial life intentionally avoids communicating with Earth to promote natural evolution and sociocultural development and to avoid interplanetary contamination, similar to how humans observe animals in a zoo. This hypothesis attempts to explain the apparent absence of extraterrestrial life despite its generally accepted plausibility and reasonable expectation of its existence. A variant of the Zoo Hypothesis proposed by John Allen Ball, a former scientist at MIT's Haystack Observatory, is the Laboratory Hypothesis, which suggests that humanity is being experimented on and Earth is a giant laboratory. For example, once humanity passes certain technological, political, or moral standards, aliens may choose to allow contact. They may refuse contact until humanity forces it, possibly by sending spacecraft to their planets. Alternatively, reluctance to initiate contact may reflect a wise desire to minimize risk.