Live coverage: Ariane 5 blasts off with two Intelsat satellites

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.

Arianespace has postponed this week’s launch of an Ariane 5 rocket with two European communications satellites to replace a faulty fluid connector between the launcher and its mobile launch platform, officials said Tuesday.

U.S. Air Force officials signed off Monday on a plan for SpaceX and United Launch Alliance, rivals in the launch services market, to fire off Falcon 9 and Atlas 5 rockets from neighboring launch pads at Cape Canaveral on Tuesday evening and Thursday morning.