Live coverage: Delta 2 launches

The Atlas 5 rocket blasts off from Vandenberg Air Force Base in California for its late-night ascent to deploy the NROL-42 payload for the National Reconnaissance Office.

SpaceX launched 60 more Starlink satellites from the Kennedy Space Center at 7:29 a.m. EDT (1129 GMT) Tuesday aboard a Falcon 9 rocket. Meanwhile, the launch of another SpaceX rocket a few miles away with a GPS satellite has been postponed indefinitely after a countdown abort moments before liftoff Friday night.

Resuming space launches from the U.S. Western Range at Vandenberg Air Force Base in California after a half-year infrastructure outage, an Atlas 5 rocket will boost a commercial Earth-imaging bird into orbit on Friday.