Background from the Knowledge Base
SETI: The Scientific Search for Extraterrestrial Intelligence
Learn about SETI, the scientific effort to detect intelligent alien life through radio signals and other methods, including its history, technology, and findings.
SETI@home: The Screensaver That Searched for Aliens for 21 Years
SETI@home let millions of home computers sift Arecibo radio data for alien signals from 1999 to 2020. How it worked, what it found, the one false alarm, why it went into hibernation, and what replaced it.
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