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This is from a scientific point of view. For aliens in popular culture see extraterrestrial life (popular culture). For other uses, see Extraterrestrial (disambiguation).

Extraterrestrial life is life that may exist and originate outside the planet Earth, the only place in the Universe known to support life. Its existence is currently hypothetical; there is as yet no evidence of extraterrestrial life that has been widely accepted by scientists.

Most scientists hold that if extraterrestrial life exists, its evolution would have occurred independently in different places in the universe. An alternative hypothesis, held by a minority, is panspermia, which suggests that life in the universe could have stemmed from a smaller number of points of origin, and then spread across the universe, from habitable planet to habitable planet. These two hypotheses are not mutually exclusive.

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Extrasolar Planets :: Astronomy
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Official disclosure of extraterrestrial life is imminent | Tim Keeling: 'Alien Autopsy' – Chris Rowson .. http://bit.ly/7uGtEe
thealienproject (Andre Heath) Sun, 22 Nov 2009 13:14:45 -0000
Official disclosure of extraterrestrial life is imminent | Tim Keeling: 'Alien Autopsy' – Chris Rowson .. http://bit.ly/7uGtEe
RT @KittyBeed: RT @DerrenBrown: Blog Post: Official disclosure of extraterrestrial life is imminent http://cli.gs/T3BPH. ::: oooh. Love it.
Leztoomey (Lee Toomes) Sun, 22 Nov 2009 12:28:42 -0000
RT @KittyBeed: RT @DerrenBrown: Blog Post: Official disclosure of extraterrestrial life is imminent http://cli.gs/T3BPH. ::: oooh. Love it.
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Life Extraterrestrial: Life on Other Planets in the Solar System - Curriculum framework for comparing Earth to other planets with regard to life.
Meta Description: [ The Xlife Website has been created to serve as a resource instrument for the Middle School Science Objective in the Michigan Curriculum Framework: Compare the Earth to Other Planets with regard to Life. A pair of student teleconferences, originating at Wayne RESA's Electonic Communication... ]

Search for ET! - Interactive Flash tutorial exploring the possibility of and search for life on other worlds.
Meta Description: [ Is earth the only planet in all the vast universe on which life began? Herein we give an account of the following four themes, with the help of graphics and the latest data: the possibility of life on Mars, the oceans on Jupiter's satellite Europa, the search for space people by means of radio te... ]

The Planetary Society - A nonprofit organization devoted to the exploration of the solar system and the search for extraterrestrial life.

The Rise and Fall of Star Faring Civilizations in Our Own Galaxy - Speculation, based on the Drake Equation, regarding the existence and composition of alien civilizations.
Meta Description: [ The Rise and Fall of Star Faring Civilizations in Our Own Galaxy Introduction ]

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Carl Sagan on Search for Extraterrestrial Intelligence -1979:

Carl Sagan speaks about the search for extraterrestrial intelligence. Cosmos series, episode 12 "The Enciclopaedia Galactica"

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