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

SpaceX called off a launch attempt in Texas Monday for the Super Heavy booster and Starship launch vehicle, blaming a bad valve on the first stage. The next launch attempt for the world’s largest rocket is scheduled for Thursday, depending on weather and a fix for the valve problem.

The most powerful version of United Launch Alliance’s Atlas 5 rocket lifted off from Cape Canaveral at 10:30 a.m. EDT (1430 GMT) today on a three-hour flight to deploy a U.S. Navy mobile communications satellite into orbit. Follow the mission in our live journal.

Stormy weather at the Kennedy Space Center forced SpaceX to scrub the liftoff of a Falcon Heavy rocket Thursday night carrying the ViaSat 3 Americas broadband satellite to a near-geostationary orbit.