Video: Liftoff of Atlas 5 on NROL-55

Follow the key events of the Falcon 9 rocket’s ascent to orbit 60 satellites for SpaceX’s Starlink broadband network.

Plans to launch a Navy communications satellite aboard an Atlas 5 rocket early Monday could be interrupted by Tropical Storm Erika, expected to strengthen into a hurricane, as the cyclone puts its sights on Florida.

United Launch Alliance crews at Cape Canaveral have topped off an Atlas 5 rocket for liftoff Monday with the U.S. military’s next infrared sentinel to join a satellite fleet designed detect missile launches around the world.