Photos: Atlas 5 rolls out for launch

NASA’s Perseverance rover has been closed up inside its protective aeroshell, the structure that will protect the spacecraft when it plunges into the Martian atmosphere, in preparation for launch no earlier than July 20 from Cape Canaveral.

The United Launch Alliance Atlas 5 rocket, standing 189 feet tall and and weighing 840,000 pounds, unleashes 1.2 million pounds of thrust from its main engine and one side-mounted booster at 7:05 p.m. EDT (2305 GMT) today to launch NASA’s OSIRIS-REx mission to Asteroid Bennu.

NASA civil servants and the agency’s contractor work force are bracing for high winds and rain from Hurricane Dorian, securing rocket stages, spacecraft assembly areas and even hauling a 6.7-million-pound mobile launch tower, designed for the huge rocket being built for the Artemis moon program, back to the cavernous Vehicle Assembly Building for safekeeping.