Video: Liftoff of Delta 4 with WGS 7

After scrubbing a launch attempt Friday, SpaceX launched a Falcon 9 rocket Saturday on a mission to send communications satellites from OneWeb and Iridium into polar orbit from Vandenberg Space Force Base, California. Liftoff occurred at 6:16 a.m. PDT (9:16 a.m. EDT; 1316 UTC).

The launch of five commercial Iridium message relay satellites and a pair of U.S.-German orbiting geophysics probes on a Falcon 9 rocket from California has been delayed three days to May 22, and a week-long schedule slip to May 31 is expected for the next SpaceX flight from Cape Canaveral with an SES communications payload.

Following delivery to the launch pad, the United Launch Alliance Atlas 5 rocket stands poised for the NROL-61 mission for the National Reconnaissance Office from Cape Canaveral on Thursday morning.