search for extra-terrestrial intelligence
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The search for extra-terrestrial intelligence is an effort to find civilizations that exist somewhere beyond Earth. It matters because discovering intelligent life elsewhere would fundamentally change our understanding of our place in the universe.
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Arecibo Telescope in Puerto Rico with its 300 m (980 ft) dish was one of the world's largest filled-aperture (i.e., full dish) radio telescopes and conducted some SETI searches.
The search for extraterrestrial intelligence (usually shortened as SETI) is the diverse efforts and scientific projects intended to detect extraterrestrial signals, or any evidence of intelligent life beyond Earth.