Live coverage: SpaceX supply ship returns to Earth

Space station commander Jeff Williams and flight engineer Kate Rubins completed a smooth 6-hour 48-minute spacewalk Thursday, retracting a spare cooling radiator, installing two high-definition TV cameras and inspecting a massive solar array rotation mechanism that has experience subtle vibrations in recent months.

A robotic U.S. military spaceplane surpassed 719 days in orbit Monday, setting a new record for the longest flight of the Air Force’s winged X-37B orbiting experiment platform nearly two years after launching from Florida on a SpaceX Falcon 9 rocket.

Debris from SpaceX’s Falcon 9 rocket booster returned to shore in Southern California late Monday after it tipped over on touchdown on a landing platform in the Pacific Ocean following liftoff with a ocean study satellite.