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EXPLORER I , first U.S. earth satellite, launched by modified ABMA-JPL Jupiter-C , with US- International Geophysical year IGY scientific experiment of James A. Van Allen , which discovered the radiation belt around the earth. '''Click on the player to see a video clip from this day "Army Explorers in Space".'''
File:Armyspace1958.mp4

... .S. satellite, Explorer I , launched by the Army Ballistic Missile Agency and Jet Propulsion Laboratory Jan. 31, 1958. The U.S. and the Western world had entered an age of space with the ... 21 Jan 22 1973 22 Jan 23 1973 23 Jan 24 1973 24 Jan 25 1973 25 Jan 26 1973 26 Jan 27 1973 27 Jan 28 1973 28 Jan 29 1973 29 Jan 30 1973 30 Jan 31 1973 31 February ...

... U.S. satellite. Since its launch Jan. 31, 1958, the 30.8-lb stovepipe-shaped satellite had completed nearly 60,000 revolutions around earth and on Dec. 31, 1968, was in orbit with 632 ... 21 Jan 22 1969 22 Jan 23 1969 23 Jan 24 1969 24 Jan 25 1969 25 Jan 26 1969 26 Jan 27 1969 27 Jan 28 1969 28 Jan 29 1969 29 Jan 30 1969 30 Jan 31 1969 31 February ...

... beyond our present capabilities." ''(Text)'' Twelfth anniversary of Explorer I , first U.S. satellite. Launched Jan. 31, 1958, stovepipe-shaped 14-kg (30.8-lb) satellite was in orbit with 585.7-km ... 21 Jan 22 1970 22 Jan 23 1970 23 Jan 24 1970 24 Jan 25 1970 25 Jan 26 1970 26 Jan 27 1970 27 Jan 28 1970 28 Jan 29 1970 29 Jan 30 1970 30 Jan 31 1970 31 February ...

... 215-mi ''(346-km)'' perigee, and 100-min period, had stopped transmitting data May 23, 1958, after supplying data on cosmic rays, micrometeoroids, and temperature and discovering one of earth' ... 21 Jan 22 1968 22 Jan 23 1968 23 Jan 24 1968 24 Jan 25 1968 25 Jan 26 1968 26 Jan 27 1968 27 Jan 28 1968 28 Jan 29 1968 29 Jan 30 1968 30 Jan 31 1968 31 February ...

... Jan 21 1964 21 Jan 22 1964 22 Jan 23 1964 23 Jan 24 1964 24 Jan 25 1964 25 Jan 26 1964 26 Jan 27 1964 27 Jan 28 1964 28 Jan 29 1964 29 Jan 30 1964 30 Jan 31 1964 31 February ...

... Jan 21 1971 21 Jan 22 1971 22 Jan 23 1971 23 Jan 24 1971 24 Jan 25 1971 25 Jan 26 1971 26 Jan 27 1971 27 Jan 28 1971 28 Jan 29 1971 29 Jan 30 1971 30 Jan 31 1971 31 February ...

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... Jan 21 1967 21 Jan 22 1967 22 Jan 23 1967 23 Jan 24 1967 24 Jan 25 1967 25 Jan 26 1967 26 Jan 27 1967 27 Jan 28 1967 28 Jan 29 1967 29 Jan 30 1967 30 Jan 31 1967 31 February ...

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