Atlas 5 NROL-55 launch full broadcast

A United Launch Alliance Atlas 5 rocket emerged from its vertical hangar Tuesday for the 1,800-foot journey to pad 41 at Cape Canaveral Air Force Station, moving into position for liftoff Thursday with NASA’s Mars 2020 Perseverance rover.

Taking delivery of the Atlas 5 rocket that will boost an advanced weather observatory into space next month, United Launch Alliance and the Air Force are back at work following disruptions from Hurricane Matthew.

An hour after OSIRIS-REx separated from the United Launch Alliance Atlas 5 rocket on its trajectory to Asteroid Bennu, officials from NASA, the University of Arizona, ULA and Lockheed Martin held the post-launch news conference from Kennedy Space Center.