NASA

The SpaceX Dragon cargo craft arrived at the International Space Station April 20, delivering almost 5,000 pounds of scientific experiments and supplies for the Expedition 39 crew. Dragon was launched atop the commercial company's Falcon 9 rocket April 18 from Space Launch Complex 40 at the Cape Canaveral Air Force Station, Fla., on the third commercial resupply mission to the station for SpaceX. After a two-day rendezvous to catch up to the orbital laboratory, Dragon was grappled by Expedition 39 Commander Koichi Wakata of the Japan Aerospace Exploration Agency and NASA Flight Engineer Rick Mastracchio and berthed to the Earth-facing port of the Harmony module using the station's Canadian-built robot arm, where it will remain until it departs the outpost on May 18 for a parachute-assisted return to Earth and a splashdown in the Pacific west of Baja California. Show less