When the STS-135 astronauts left the International Space Station (ISS) in 2011 to close out the final space shuttle mission, they left behind an American flag to be returned by the next crew to reach the outpost aboard a U.S. spacecraft. The flag is still there, but probably not for too much longer.  NASA’s grand experiment to turn over low-Earth-orbit (LEO) crew transportation services to private companies passed a critical milestone on March 3, with the successful docking of ...

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