As the Army's first satellite, Explorer I, speeds around the earth, it wastes most of its radio broadcasts on the unheeding ocean, where only a few ship's operators are listening. Explorer III, which started its orbiting last week, is a higher stage of satellite evolution. It has a memory, and if asked, will tell all it knows.
Explorer Ill's memory is a midget tape recorder (weight, ½ Ib.; diameter, 2.5 in.) designed by Graduate Student George Ludwig of the State University of Iowa and fitted for space by the Jet Propulsion Laboratory at Pasadena. While the satellite circles the earth, a delicate...
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