Q&A with Elon Musk, SpaceX’s founder and CEO

Wrapping up SpaceX’s fourth operational resupply flight to the International Space Station, a Dragon cargo capsule departed the high-flying research complex, dropped out of orbit and descended to a parachute-assisted splashdown in the Pacific Ocean with nearly 3,300 pounds of biological specimens and hardware.

Russian engineers will replace rocket engines on two Soyuz rockets assigned to send a batch of supplies and the next crew to the International Space Station after an investigation revealed foreign objects or a manufacturing defect led to the crash of a Progress cargo craft on launch in December, according to Russian media reports and a statement from the Russian space agency.

Veteran Russian commander Oleg Novitskiy, rookie flight engineer Pyotr Dubrov, and NASA astronaut Mark Vande Hei launched into orbit Friday from the Baikonur Cosmodrome in Kazakhstan at 3:42 a.m. EDT (0742 GMT). The crew members rode a Soyuz capsule in pursuit of the International Space Station, where docking occurred at 7:05 a.m. EDT (1105 GMT).