SpaceX successfully launched a Falcon 9 rocket on Friday and, despite the odds, landed the first stage on a ship in the Atlantic Ocean. A SpaceX Dragon cargo spaceship was grappled by the International Space Station's Canadarm2 on April 10, following an April 8 launch from Cape Canaveral. CAPE CANAVERAL -- The coming week is another big one for SpaceX, whose unmanned Dragon capsule is scheduled to depart the International Space Station and return to Earth on Wednesday morning. The station's 58-foot robotic arm is expected to release the Dragon and its 3,700 pounds of cargo at 9:18 a.m. Because of a failed launch last summer, this Dragon will be the first to return science experiments and hardware from the ISS in a year.