what is alien more than 50-80 word
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Extraterrestrial life is hypothetical life which may occur outside of Earth and which did not originate on Earth. Such life might range from simple prokaryotes to beings with civilizations far more advanced than humanity. The Drake equation speculates about the existence of intelligent life elsewhere in the universe.
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There are many things in the universe as it is versatile. Life exists on Earth in our solar system. It can also be imagined on other planet.
The species found on planets or star other than Earth is called alien. Humans are trying their best to find life on other planet. Pioneer-10 was one of that efforts. It was sent in 1969.
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