The zoo hypothesis speculates on the assumed behavior and existence of technologically advanced extraterrestrial lifeand the reasons they refrain from contacting Earth. It is one of many theoretical explanations for the Fermi paradox. The hypothesis states that alien life intentionally avoids communication with Earth to allow for natural evolution and sociocultural development, and avoiding interplanetary contamination, similar to people observing animals at a zoo. The hypothesis seeks to explain the apparent absence of extraterrestrial life despite its generally accepted plausibility and hence the reasonable expectation of its existence.^[1] A variant on the zoo hypothesis suggested by the former MIT Haystack Observatory scientist John Allen Ball is the “laboratory” hypothesis, in which humanity is being subjected to experiments, with Earth serving as a giant laboratory.

Aliens might, for example, choose to allow contact once the human species has passed certain technological, political, and/or ethical standards. Alternatively, aliens may withhold contact until humans force contact upon them, possibly by sending a spacecraft to an alien-inhabited planet. In this regard, reluctance to initiate contact could reflect a sensible desire to minimize risk. An alien society with advanced remote-sensing technologies may conclude that direct contact with neighbors confers added risks to itself without an added benefit. In the related laboratory hypothesis, the zoo hypothesis is extended such that the ‘zoo keepers’ are subjecting humanity to experiments, a hypothesis which Ball describes as “morbid” and “grotesque”, overlooking the possibility that such experiments may be altruistic, i.e., designed to accelerate the pace of civilization to overcome a tendency for intelligent life to destroy itself, until a species is sufficiently developed to establish contact, as in the zoo hypothesis

The zoo hypothesis assumes, first, that whenever the conditions are such that life can exist and evolve, it will, and secondly, there are many places where life can exist and a large number of extraterrestrial cultures in existence. It also assumes that these extraterrestrials have great reverence for independent, natural evolution and development. In particular, assuming that intelligence is a physical process that acts to maximize the diversity of a system’s accessible futures, a fundamental motivation for the zoo hypothesis would be that premature contact would “unintelligently” reduce the overall diversity of paths the universe itself could take

These ideas are perhaps most plausible if there is a relatively universal cultural or legal policy among a plurality of extraterrestrial civilizations necessitating isolation with respect to civilizations at Earth-like stages of development. In a universe without a hegemonic power, random single civilizations with independent principles would make contact. This makes a crowded universe with clearly defined rules seem more plausible

If there is a plurality of extraterrestrial cultures, however, this theory may break down under the uniformity of motive concept because it would take just a single extraterrestrial civilization to decide to act contrary to the imperative within human range of detection for it to be undone, and the probability of such a violation of hegemony increases with the number of civilizations. This idea, however, becomes more plausible if all civilizations tend to evolve similar cultural standards and values with regard to contact much like convergent evolution on Earth has independently evolved eyes on numerous occasions, or all civilizations follow the lead of some particularly distinguished civilization, such as the first civilization among them

1937: In Olaf Stapledon’s 1937 novel Star Maker, great care is taken by the Symbiont race to keep its existence hidden from “pre-utopian” primitives, “lest they should lose their independence of mind.” It is only when such worlds become utopian-level space travellers that the Symbionts make contact and bring the young utopia to an equal footing

1950s

• 1951: Arthur C. Clarke‘s The Sentinel (first published in 1951) and its later novel adaptation 2001: A Space Odyssey (1968) feature a beacon which is activated when the human race discovers it on the moon.

The zoo hypothesis states that intelligent extraterrestrial life exists and does not contact life on Earth to allow for its natural evolution and development

The Great Filter theory is the idea that there is a barrier to development that makes detectable extraterrestrial life very rare. This barrier exists between the earliest stages of abiogenesis and the highest levels of development on the Kardashev scale. 

The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way Galaxy

METI (Messaging Extraterrestrial Intelligence)Overcoming the zoo hypothesis is one of the goals of METI, an organization created in 2015 to communicate with extraterrestrials, an active form of the search for extraterrestrials (SETI

Messaging Extraterrestrial Intelligence (METI) is a non-profit research organization that sends interstellar messages to communicate with extraterrestrial civilizations. METI was founded in 2015 by Douglas Vakoch and is based in San Francisco. 

METI is also known as Active SETI. However, this view is not universally accepted. Some people are against the transmission of interstellar radio messages, but are not against SETI searching. This duality is called the SETI Paradox. 

Stephen Hawking and other authors and scientists have expressed concerns about METI, which is known as the Dark forest hypothesis of ETI. The theory and some of its implications are explored in Cixin Liu’s Remembrance of Earth’s Past.

Yes, Messaging Extraterrestrial Intelligence (METI) is a non-profit organization that sends interstellar messages to communicate with extraterrestrial civilizations. METI was founded in 2015 by Douglas Vakoch and is based in San Francisco, California. 

METI is also known as Active SETI. Communication with Extraterrestrial Intelligence (CETI) is a branch of the Search for Extraterrestrial Intelligence (SETI) that focuses on creating and deciphering interstellar messages. 

Interstellar communication is the transmission of signals between planetary systems. Sending interstellar messages is potentially easier than interstellar travel, as it can be done with current technologies and equipment

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