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.
Do Aliens Exist? What Science Actually Knows in 2026
Do aliens exist? The honest answer from astronomy, biology and the search so far: how many planets there are, what biosignature claims have held up, why nobody has answered SETI, and what would count as proof.
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