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Explorers Program

Explorers Program

The Explorers program is a NASA exploration program that provides flight opportunities for physics, geophysics, heliophysics, and astrophysics investigations from space. Launched in 1958, Explorer 1 was the first spacecraft of the United States to... Wikipedia
First flight: January 31, 1958
Last flight: July 2014
Start date: 1954
Missions: Gravity and Extreme Magnetism Small Explorer, WISE, and Explorer 1