Live coverage: Proton blasts off on return-to-flight mission

With an eye on dangerous Hurricane Irma’s forecast path toward Florida, SpaceX and the U.S. Air Force are proceeding with preparations to launch an unpiloted reusable military spaceship Thursday on a mission to conduct experiments in orbit, deploy multiple small satellites and glide back to Earth for a runway landing after months or years in space.

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.

A Boeing-built satellite on the way to join Inmarsat’s globe-spanning network geared to beam Internet and data transmission capacity to airline passengers, maritime crews and military personnel flew into orbit Monday from NASA’s Kennedy Space Center in Florida aboard an expendable Falcon 9 rocket.