Extraterrestrial Hypothesis

The extraterrestrial hypothesis (ETH) is the hypothesis that some unidentified flying objects (UFOs) are best explained as being extraterrestrial life or non-human aliens from other planets occupying physical spacecraft visiting Earth.

Read more about Extraterrestrial Hypothesis:  Etymology, Chronology, Analyzing ETH, Opinions Among Scientists, NASA, Conspiracy, Official White House Position

Famous quotes containing the word hypothesis:

    It is an hypothesis that the sun will rise tomorrow: and this means that we do not know whether it will rise.
    Ludwig Wittgenstein (1889–1951)