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SETI (Search for Extra-Terrestrial Intelligence) is a collective term for activities that search for extraterrestrial life, specifically intelligent life, "out there." When people talk about "SETI" as an entity, they usually mean the SETI Institute, a non-profit organization, or conflating other people's efforts with the Institute.
 Aliens on my radio
Most signals received and analysed have turned out to have natural explanations, but regardless, the methods employed by the group are scientifically sound and their reported signals are often featured in prominent journals. So even if SETI doesn't find life out there, it has found some very interesting non-life out there.
 See also
- The Arecibo message wouldn't be within RationalWiki's mission, but we have an article on the Arecibo answer
- The Drake Equation for guessing probability of intelligent extraterrestrial life.