Live coverage: 400th Proton rocket takes off with Russian satellite

A SpaceX Falcon 9 rocket, powered by a previously-flown booster, lifted off from NASA’s Kennedy Space Center in Florida at 6:27 p.m. EDT (2227 GMT) Thursday. The mission, which lofted the SES 10 communications satellite, marks the first time SpaceX has reused the first stage of one of its Falcon 9 launchers.

NASA wants to fly an astronaut on Russia’s next Soyuz mission to the International Space Station in April, a measure the agency says would ensure a continued U.S. presence on the research outpost in case of delays in the launch of SpaceX’s next Crew Dragon flight.

A United Launch Alliance Atlas 5 rocket departed Cape Canaveral at 11:36 a.m. EDT (1536 GMT) to deploy the Global Positioning System 2F-10 navigation satellite.