Alien
Hypothetical intelligent beings originating beyond Earth, a subject of scientific search as well as science fiction and popular culture.
SETI@home used volunteers' idle computers to scan space for extraterrestrial signals. Aimed at 50,000–100,000 machines, it drew 5.2 million participants and logged over 2 million years of computing—about 50x faster than the world's top supercomputer in 2013.
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