Photos: Delta 4 lights up the sky for night owl launch

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.

Slung under the belly of a specially-equipped carrier airplane, a Northrop Grumman Pegasus rocket took off Wednesday from Vandenberg Air Force Base on a two-day trek to a remote U.S. military test site in the Pacific Ocean, where crews will ready the air-dropped booster for launch of a NASA research satellite next week.

Brisk upper level winds blowing from the west thwarted a second try to launch a new NOAA weather satellite aboard a United Launch Alliance Delta 2 rocket Wednesday, likely postponing the liftoff from Vandenberg Air Force Base in California until at least Saturday.