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)