Photos: Atlas 5 rocket aims for International Space Station

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.

The final flight of Russia’s Rockot launcher took off Thursday and placed four satellites into orbit nearly 1,000 miles above Earth, ending a run of 31 launches since May 2000.

SpaceX’s Crew Dragon spacecraft will likely return to Earth in August to wrap up a test flight to the International Space Station with NASA astronauts Doug Hurley and Bob Behnken, a senior space agency official said Tuesday.