Watch SpaceX launch its second used Falcon 9 rocket for NASA this afternoon

Just three days after sending 10 communications satellites into orbit from California, SpaceX is launching again, this time out of Cape Canaveral, Florida. The company is launching one of its previously flown Falcon 9 rockets, which will send up 5,800 pounds of supplies and science experiments to the International Space Station. That cargo will be riding atop the rocket inside one of SpaceX's Dragon capsules -- which flew to the ISS once before, too. This is the second time NASA is relying on a ...