SpaceX's newly launched Dragon capsule with four astronauts arrived Monday at the International Space Station (ISS), their new home until spring. The capsule pulled up and docked late Monday night, following a 27-hour, completely automated flight from NASA's Kennedy Space Center.

This is the second astronaut mission for SpaceX. But it's the first time Elon Musk's company delivered a crew for a full half-year station stay.

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