High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! Explorer 1 (1958 Alpha 1) was the first Earth satellite of the United States as part of the program for the International Geophysical Year and in response to the launch of the Soviet satellite Sputnik 1. It was launched on 31 January 1958 at 22:48 local time (Cape Canaveral, Florida) atop the first Juno booster from LC-26 at Cape Canaveral Air Force Station, Florida. It was the first spacecraft to recognize the Van Allen radiation belt.

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