SETI@home is a scientific experiment that uses Internet-connected computers in the Search for Extraterrestrial Intelligence (SETI). You can participate by running a free program that downloads and analyzes radio telescope data.
Arecibo Observatory, radio-astronomy facility (completed 1963) located at Arecibo, PUERTO RICO; it is operated by Cornell University under contract with the U.S. National Science Foundation. Its fixed antenna of spherical section, 1,000 ft (305 m) in diameter, is the largest radio-telescope antenna in the world.
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