SpaceX's historic encore: Astronauts arrive at space station

SpaceX delivered two astronauts to the International Space Station for NASA on Sunday, following up a historic liftoff with an equally smooth docking in yet another first for Elon Musk's company.The docking occurred a little early, barely 19 hours after a SpaceX Falcon 9 rocket blasted off Saturday afternoon from Kennedy Space Center, the nation’s first astronaut launch to orbit from home soil in nearly a decade.