Photos: Delta 4 rocket fires off the pad before sunset

The launch of a top secret National Reconnaissance Office spy satellite from Vandenberg Air Force Base in California has been pushed back from Dec. 13 until no earlier than Jan. 10 to complete software validation on the Delta 4 rocket’s new avionics system, United Launch Alliance announced Wednesday.

Setting new commercial launch and satellite industry records, a SpaceX Falcon 9 rocket propelled by a first stage booster launched and recovered two times before soared into a clear morning sky over California’s Central Coast on Monday with 64 small satellites, then returned to a pinpoint landing on a vessel parked offshore in the Pacific Ocean, potentially to be flown again.

SpaceX test-fired a Falcon 9 rocket Saturday at Cape Canaveral, two days before a scheduled launch Monday with 60 Starlink broadband relay stations that will make SpaceX the owner of the world’s largest fleet of commercial satellites.