Live coverage: Atlas 5 countdown and launch journal

Two weeks after a sensor problem forced a delay, an Ariane 5 rocket blasted off at 6:04 p.m. EDT (2204 GMT) Saturday from French Guiana with two commercial communications satellites to cover the United States and Japan, and a Northrop Grumman-built robotic satellite servicing mission designed to link up with another spacecraft in geostationary orbit.

NASA’s OSIRIS-REx spacecraft is about to be sealed inside the nose fairing of its Atlas 5 rocket booster for a seven-year voyage to asteroid Bennu and back to Earth on a mission to seek out clues to the origin of life and the chaotic early solar system.

Engineers from Boeing and a team of subcontractors have finished building the first pair of six new solar arrays to bolster the International Space Station’s aging electrical system ahead of their launch to the orbiting outpost as soon as May aboard SpaceX’s next Cargo Dragon mission.