Astronauts John Grunsfeld (at bottom) and Andrew Feustel worked to repair the Hubble Space Telescope with American flags clearly seen on the outside of their spacesuits. A 209-foot-tall U.S. flag on ...

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US President Donald Trump said Saturday he was withdrawing his nomination of tech billionaire Jared Isaacman, a close ally of Elon Musk, to lead space agency NASA.

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