Live coverage: SpaceX launches 52 Starlink satellites from California

The United Launch Alliance Atlas 5 rocket, standing 189 feet tall and and weighing 720,000 pounds, unleashes 860,000 pounds of thrust from its main engine at 10:30 a.m. local time (1:30 p.m. EST; 1830 GMT) today to launch the commercial WorldView 4 Earth-imaging satellite for DigitalGlobe from Vandenberg Air Force Base, California.

The U.S. Air Force on Monday certified the latest version of SpaceX’s Falcon 9 rocket, featuring higher-thrust engines, enlarged fuel tanks and a super-chilled propellant mixture, for launches of the military’s most valuable satellites.

Inverted cables on the Vega rocket’s upper stage control system apparently caused the launcher to tumble minutes after liftoff Monday night, a failure that resulted in the loss of a Spanish Earth observation satellite and a French research probe, Arianespace officials said Tuesday.