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Extraterrestrial (or extra-terrestrial) may refer to any object or being beyond (extra-) the planet Earth (-terrestrial). It is derived from the Latin extra ("outside", "outwards") and terrestris ("earthly", "of or relating to the Earth"). It may also refer to:

• Extraterrestrial life, in scientific context, hypothetical life that exists outside of Earth.
• Extraterrestrials in fiction, describes purported alien types recovered from UFO crashes (these are usually assumed to be non-human, although theoretically a transplanted culture of humans on another planet would also qualify as extraterrestrials, as with the character of Jonas Quinn on Stargate: SG-1).
• Extraterrestrial, a program on the National Geographic Channel
• Outer space, the location of things that are "outside Earth"
• E.T. the Extra-Terrestrial

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