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Here are details about a : Space commemorative cover or Space Cover.
Cosmodrom : USA
Date of Cancellation: July 26, 1958 Kind of Event : Launch Launch pad : USA KSC (FL)
habité?/manned?: robot Mission type : Experimental & Science
ou?/where?: au sol - ground
autographe?: non - none
Description : Explorer IV satellite launched at Cap Canaveral, president Eisenhower reports satellite successful in orbit.
The Department of Defense’s Advanced Research Projects Agency had initially planned two satellites for the purposes of studying the Van Allen radiation belts and the effects of nuclear explosions upon these belts (and the Earth’s magnetosphere in general), however Explorer 4 was the only such satellite launched as the other, Explorer 5, suffered launch failure.