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1987 creatures 4.3 light-years Aeronautics and Space alien radio signals alien spacecraft Arizona Astronauts astronomer brain broadcast California called captured no alien channels at once distance that light distant eight exists elsewhere exploration extraterrestrial intelligence find alien signals flying saucer Frank Drake Harvard hunted Jupiter Kitt Peak National LIBRAE Listening magic frequency Mars Martian Massachusetts META Mexico miles per second million Moon moves NASA National Aeronautics nearby stars nearest star nine objects that orbit orbit stars Paul Horowitz Peak National Observatory photograph picked picture shown planets probably Project Ozma prove Proxima Centauri radio telescope radio waves reach Saturn scan scientific Scientists say search for extraterrestrial sent separate channels SETI PROJECT ships Socorro Solar System Space Administration speed of light Suitcase SETI take 20 temperatures Terrestrial thousand trillion UFO's unidentified universe Venus VISITED EARTH wanted to contact worlds