Extraterrestrial life (from the Latin words: extra and terrestris ) is defined as life that does not originate from Earth. It is often also referred to as alien life, or simply aliens (or space aliens, to differentiate from other definitions of alien or aliens). These hypothetical forms of life range from simple bacteria-like organisms to beings far more complex than humans.
The development and testing of hypotheses on extraterrestrial life is known as exobiology or astrobiology; the term astrobiology, however, includes the study of life on Earth viewed in its astronomical context. Many scientists consider extraterrestrial life to be plausible, but there is no conclusive evidence for its existence. Since the mid-20th century, there has been an ongoing search for signs of extraterrestrial life, from radios used to detect possible extraterrestrial signals, to telescopes used to search for potentially habitable extrasolar planets. It has also played a major role in works of science fiction.
Other articles related to "alien intelligence, aliens, alien":
... other worlds, and to confirm that at least other planets are plentiful, though aliens remain a question mark ... Stephen Hawking in 2010 warned that humans should not try to contact alien life forms ... He warned that aliens might pillage Earth for resources ...
Famous quotes containing the words intelligence and/or alien:
“A German immersed in any civilization different from his own loses a weight equivalent in volume to the amount of intelligence he displaces.”
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