In popular cultures, "Extraterrestrials" are life forms — especially intelligent life forms— that are of extraterrestrial origin (often also called "aliens").
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“For Jeremy, direct, unmediated experience was always hard to take in, always more or less disquieting. Life became safe, things assumed meaning, only when they had been translated into words and confined between the covers of a book.”
—Aldous Huxley (1894–1963)