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When was the explorer 1, 1st american satellite, launch in the orbit?

April 26, 2017American Astronomy Explorer launch Mathematics satellite

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When was the explorer 1, 1st american satellite, launch in the orbit?

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Explorer-I, officially Satellite 1958 Alpha (and sometimes referred to as Explorer 1), was the first Earth satellite of the United States, having been launched at 10:48pm EST on January 31 (03:48 on 1 February in GMT), 1958, as part of the United States program for the International Geophysical Year. The satellite was launched from LC-26 at Cape Canaveral Air Force Station in Florida onboard a Juno I rocket.