Live coverage: Atlas 5 rocket lifts off from Cape Canaveral

A replay of the United Launch Alliance Atlas 5 rocket launching Mexico’s Morelos 3 communications satellite from Cape Canaveral, Florida.

The early months of NASA’s OSIRIS-REx mission’s exploration of asteroid Bennu have revealed big surprises, scientists said Tuesday, including plumes of particles streaming away from the asteroid, sometimes with enough velocity for rocks to break out of Bennu’s tenuous gravitational grip and escape into space.

SpaceX test-fired the Falcon 9 rocket early Saturday ahead of launch with the next four astronauts heading to the International Space Station. The static fire test before sunrise Saturday in Florida was a major step toward liftoff Thursday.