http://www.rssboard.org/rss-specification 720 http://ecuip-xtf.lib.uchicago.edu/xtf/search?expand%3Dsubject;f5-subject%3DVanguard%201;f4-associated-Lesson%3DX-Ray%20History Results for your query: expand=subject;f5-subject=Vanguard 1;f4-associated-Lesson=X-Ray History Thu, 01 Jan 1970 12:00:00 GMT http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/vanguard1_from_NRL/vanguard1_from_NRL.dc.xml Between 1955 and 1959, NRL conducted the first American satellite program, named Project Vanguard. On March 17, 1958, the Vanguard I satellite was successfully launched into Earth orbit. Just 6 inches (152 mm) in diameter and weighing 3 pounds (1.4 kg), Vanguard 1 was described by then-Soviet Premier Nikita Khrushchev as, "The grapefruit satellite." Here NRL scientists from the Vanguard I team mount the satellite in the rocket. Vanguard 1 is the oldest artificial satellite still in space, as its predecessors, Sputnik 1, Sputnik 2, and Explorer 1, have fallen out of orbit. http://ecuip-xtf.lib.uchicago.edu/xtf/view?docId=grxr/vanguard1_from_NRL/vanguard1_from_NRL.dc.xml Thu, 01 Jan 1970 12:00:00 GMT