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:

    The wheels and springs of man are all set to the hypothesis of the permanence of nature. We are not built like a ship to be tossed, but like a house to stand.
    Ralph Waldo Emerson (1803–1882)