Live coverage: Atlas 5 blasts off with Navy satellite

At Cape Canaveral’s Vertical Integration Facility, adjacent to the Complex 41 launch pad, workers with United Launch Alliance stacked the Atlas 5 rocket that will propel NASA’s OSIRIS-REx spacecraft on its voyage to Asteroid Bennu.

Two-and-a-half days after launch from Virginia, a Northrop Grumman Cygnus supply ship arrived at the International Space Station Tuesday with nearly 7,500 pounds of cargo. Capture with the station’s robotic arm occurred at 4:05 a.m. EST (0905 GMT).

SpaceX is gearing up for the first commercial launch of its powerful Falcon Heavy rocket as soon as early April with a communications satellite for Arabsat, and the U.S. Air Force hopes the two side boosters from the Arabsat mission can be safely landed and reused for the military’s first Falcon Heavy mission this summer, an exercise officials said will help certify previously-flown hardware for future national security launches.