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The first astronauts launched by Elon Musk's SpaceX company departed the International Space Station on Saturday night for the final and most important part of their test flight, returning to Earth with a rare splashdown. NASA's Doug Hurley and Bob Behnken bid farewell to the three men left behind as their SpaceX Dragon capsule undocked and headed toward a Sunday afternoon descent by parachute into the Gulf of Mexico. Despite Tropical Storm Isaias' surge toward Florida's Atlantic shore, NASA said the weat
