It might sound like something that’s purely science fiction, but it’s a legitimate and busy area of scientific research. Astronomers are attempting to find signs that intelligent life might exist out in the universe beyond Earth. The search for extraterrestrial intelligence, or SETI, is a field that has one huge primary challenge, and that’s the sheer size of space. Even if there are other civilizations out there, the gulf between galaxies is so large that signals would take millions
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