Live coverage: Falcon 9 disintegrates after launch

The launch of a European Ariane 5 rocket was aborted moments after its main engine ignited Tuesday. The dramatic last-second hold was the first time an Ariane rocket launch was aborted after engine start since March 2011. Arianespace has not set a new target launch date for the mission, which will loft two U.S.-built communications satellites for Intelsat and B-SAT.

The NROL-149 mission was the sixth and final mission of the year supporting the agency’s proliferated architecture. Liftoff from pad 4 East at Vandenberg Space Force Base happened at 5:19 a.m. PST (8:19 a.m. EST, 1319 UTC).

A new space weather observatory to be stationed a million miles from Earth has been enclosed inside the nose cone of a SpaceX Falcon 9 rocket for liftoff Sunday from Cape Canaveral.