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Greedo 001

Greedo from Star Wars.

An extraterrestrial, or alien, is a life form indigenous to an environment outside the planet Earth. Many are sentient humanoids physically indistinguishable from a standard human being, while others, such as the Xenomorph, bear physiology completely unlike anything found on the planet Earth. Aliens are frequently used as both protagonists and antagonists in the science fiction medium and have practically become a staple for the genre as a whole.

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