Live coverage: Proton rocket blasts off with Astra 2G

Russian officials have delayed until Saturday the launch of a Proton rocket from Kazakhstan with the Spektr-RG X-ray astronomy observatory, an ambitious mission jointly developed with Germany to probe dark energy.

SpaceX’s fifth launch for Iridium’s upgraded mobile communications network occurred at 7:13 a.m. PDT (10:13 a.m. EDT; 1413 GMT) Friday from Vandenberg Air Force Base, California. The Falcon 9 rocket flew with a reused first stage, but SpaceX did not intend to recover the booster after Friday’s launch.

An Ariane 5 rocket took off on a rare morning launch Thursday with four Galileo navigation satellites, the heavy-lifter’s first flight in support of the European positioning and timing fleet. Liftoff from French Guiana occurred at 1306 GMT (8:06 a.m. EST).