Live coverage: Dragon cargo craft arrives at space station

One of the two Falcon 9 rockets SpaceX planned to take off in a span of less than five hours earlier this week will remain grounded indefinitely, preventing Cape Canaveral from hosting two launches on the same day for the first time in decades. But the military-run Eastern Range was ready for the back-to-back missions, and probably won’t have to wait long for the next chance for a launch doubleheader.

Ready for a flight to the International Space Station, SpaceX’s first upgraded Dragon cargo capsule rolled out to pad 39A at NASA’s Kennedy Space Center in Florida this week in preparation for launch on top of a Falcon 9 rocket.

Orbital Sciences Corp. announced Tuesday it selected United Launch Alliance’s Atlas 5 rocket to launch a Cygnus space station resupply mission in late 2015 while the company redesigns its Antares booster with a new engine following a catastrophic failure seconds after liftoff in October.