Alien refers to any life form or being that is not native to a particular place, particularly Earth. The term is often used to refer specifically to extraterrestrial life, or life that exists or may exist outside of the Earth and our solar system. The possibility of the existence of extraterrestrial life has been a topic of fascination and speculation for centuries, and scientists and researchers continue to search for evidence of life on other planets and moons in our own solar system and beyond. While there is currently no definitive evidence of the existence of aliens, the universe is vast and it is considered possible that other life forms could exist on other planets or moons. The search for extraterrestrial life is a major focus of modern astronomy and astrobiology.
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