Photos: Atlas 5 rocket on the pad with WorldView 4 satellite

The United Launch Alliance Atlas 5 rocket, standing 191 feet tall and and weighing 720,000 pounds, unleashes 860,000 pounds of thrust from its main engine at 9:49:51 a.m. local time today to launch the secret NROL-79 payload for the U.S. National Reconnaissance Office from Vandenberg Air Force Base, California.

SpaceX is readying a Falcon 9 rocket booster for launch Monday at Vandenberg Air Force Base, California, on a record-setting mission with 64 smallsats on-board that will also mark the launch provider’s first use of the same first stage for a third flight.

NASA’s InSight spacecraft, the next lander to head for Mars, lifted off Saturday from Vandenberg Air Force Base in California aboard a United Launch Alliance Atlas 5 rocket. Launch occurred in a blanket of fog at 4:05 a.m. PDT (7:05 a.m. EDT; 1105 GMT).