Photos: Atlas 5 rocket soars from West Coast

A computer-triggered abort halted the countdown of a Falcon 9 rocket Sunday at NASA’s Kennedy Space Center in Florida, pushing back the next mission in SpaceX’s launch surge until at least Monday.

SpaceX is preparing this week for the second flight of the upgraded “Block 5” version of the company’s Falcon 9 rocket, and a hold-down firing of the booster was accomplished Wednesday at Cape Canaveral ahead of a middle-of-the-night launch this weekend with a Canadian-owned commercial communications satellite. The static fire test occurred at 5 p.m. EDT (2100 GMT) Wednesday.

SpaceX’s Falcon 9 rocket lifted off Sunday from Vandenberg Air Force Base in California and carried 10 Iridium communications satellites toward a perch in low Earth orbit, then the launcher’s first stage nailed a landing on a platform positioned in the Pacific Ocean.