The zoo hypothesis is one of a number of suggestions that have been advanced in response to the Fermi paradox, regarding the apparent absence of evidence in support of the existence of advanced extraterrestrial life. According to this hypothesis, aliens would generally avoid making their presence known to humanity, or avoid exerting an influence on human development, somewhat akin to zookeepers observing animals in a zoo. continue reading »

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Xenoarchaeology is a hypothetical form of archaeology concerned with the physical remains of past (but not necessarily extinct) alien cultures. These may be found on planets or satellites, in space, the asteroid belt, planetary orbit or Lagrangian points. continue reading »

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In science fiction and ufology, a Venusian is a native inhabitant of the planet Venus. continue reading »

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An Unidentified Flying Object, or UFO, is the popular term for any aerial phenomenon that cannot immediately be identified. Some definitions, such as the one used by the USAF, define a UFO as an object unable to be identified after scrutiny, while other definitions define an object as being a UFO from the time it is first reported as being unidentified, even though most subsequently become IFOs, Identified Flying Objects. continue reading »

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Ummo or Ummoism describes a series of decades-long claims that aliens from the planet Ummo were communicating with persons on the earth. continue reading »

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The Great Filter is an implication of the failure to observe any extraterrestial life, despite considerable effort (the Fermi paradox). One possible explanation is that there is something, the Great Filter, which acts to reduce the great number of potential sites to the tiny number of intelligent species actually observed (currently just one: ours). continue reading »

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The Starchild skull is an abnormal human-like skull which was found in Mexico. Its origin and nature are contested by scientists and paranormal enthusiasts. continue reading »

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Shermer’s Last Law is:

“Any sufficiently advanced ETI is indistinguishable from God.”

It’s Michael Shermer’s modification of the third law of Arthur C. Clarke’s famous three laws. It was first mentioned in Shermer’s column Skeptic in the January 2002 issue of Scientific American Magazine. continue reading »

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