Video: Post-launch news conference

SpaceX will go for another first Thursday, this time flying a refurbished Dragon supply ship carrying nearly 6,000 pounds of cargo and experiments to the International Space Station nearly three years after its first mission.

The SpaceX Falcon 9 rocket set to loft the fifth batch of Iridium Next mobile communications satellites stands vertical on Space Launch Complex 4-East at Vandenberg Air Force Base, California.

The United Launch Alliance Atlas 5 rocket, standing 194 feet tall and and weighing a million pounds, unleashes 1.6 million pounds of thrust from its main engine and two side-mounted solid boosters to launch the secret NROL-52 payload for the U.S. National Reconnaissance Office from Cape Canaveral.