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23/05/1958 NASA contacts Explorer 1 for the last time

3:31

Explorer 1: First U.S. Satellite

1:45

1958: Explorer 1 (USA)

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Explorer 1: America's First Satellite - Classic Documentary

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The Launch of Explorer 1

First U. S. satellite stopped to transmit data. It was launched after Russian satellites Sputnik 1 and 2 as a part of American participation in the International Geophysical Year. Explorer 1 was the first spacecraft to detect the Van Allen radiation belt. It remained in orbit until 1970 and has been followed by other probes in Explorer series.
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