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Explorer I's small package of instruments produced the first major discovery of the Space Age—The Van Allen radiation belts surrounding the Earth. Explorer I burned up in the atmosphere on March 30, 1970.>>
wile the russians were trying to put onto orbit a small basket ball sized satellite that could only go beep beep beep the US was building a bigger satellite that would actually do something.
so the russians were first with the least by four months.
