Live coverage: Two Russians, one American arrive at space station

SpaceX’s final Falcon 9 launch of the year carried a classified payload for the National Reconnaissance Office, the U.S. government’s spy satellite agency. SpaceX aborted a launch attempt Thursday morning to assess a second stage sensor reading, but the Falcon 9 successfully lifted off from the Kennedy Space Center at 9 a.m. EST (1400 GMT) Saturday. The rocket’s stage landed back at Cape Canaveral eight minutes later.

NASA has announced that veteran astronauts Joe Acaba and Ricky Arnold will launch on nearly six-month expeditions aboard the International Space Station starting in September and in March 2018, filling seats aboard Russian Soyuz spaceships recently acquired in a commercial arrangement with Boeing.

A new Russian navigation satellite lifted off Saturday on top of a Soyuz rocket, riding the three-stage booster and a Fregat upper stage into orbit to supplement the country’s Glonass network providing precise global positioning and timing services.