In popular cultures, "Extraterrestrials" are life forms — especially intelligent life forms— that are of extraterrestrial origin (often also called "aliens").
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“When in a serious mood, it seems to me that those people are illogical who feel an aversion toward death. As far as I can see, life consists exclusively of horrors, unpleasantnesses and banalities, now merging, now alternating.”
—Anton Pavlovich Chekhov (1860–1904)