African American astronaut Mae Jemison, left, smiles as suit technician Sharon McDougle performs an unpressurized and pressurized leak check on her spacesuit prior to the STS-47 Spacelab-J mission on ...
On July 8, 1962, the United States detonated a 1.4-megaton nuclear weapon 400 kilometers above the Pacific Ocean. The Starfish Prime test created an artificial aurora visible from Hawaii, nearly 900 ...
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