Live coverage: Atlas 5 countdown and launch journal

United Launch Alliance called off the planned launch of an Atlas 5 rocket Wednesday at Cape Canaveral to resolve a problem with valves at the launch pad, while a SpaceX team a mile-and-a-half to the south readied a Falcon 9 rocket for liftoff Thursday evening with a GPS navigation satellite for the U.S. military.

In a commercial push to return to the Moon while celebrating the 50th anniversary of Apollo 11, Astrobotic Technology Inc. has contracted with United Launch Alliance to use an Atlas 5 rocket to send the Peregrine lander to the lunar surface in 2019.

Florida’s Space Coast is preparing for a future that could see in excess of 350 launches annually.