On August 13, 2019, NASA astronauts Doug Hurley, left, and Bob Behnken continue to work with teams from NASA and SpaceX to rehearse crew extraction from SpaceX’s Crew Dragon. via NASA https://ift.tt/2z2gPSN
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Hanging in the Balance
The Moon's rocky, uneven, and otherworldly surface features are highlighted by the terminator – the difference between light and darknes...
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