Live coverage: Falcon 9 disintegrates after launch

NASA commander Mike Hopkins, pilot Victor Glover, astronaut Shannon Walker, and Japanese mission specialist Soichi Noguchi wrapped up a 167-day mission early Sunday with a splashdown at sea aboard a SpaceX Crew Dragon capsule at around 2:56 a.m. EDT (0656 GMT).

An unpiloted space plane developed by Sierra Nevada Corp. will join cargo carriers built by SpaceX and Orbital ATK to resupply the International Space Station beginning in 2019, NASA announced Thursday.

Doug Hurley and Bob Behnken, two veteran space shuttle fliers, are gearing up to fly a privately-developed SpaceX Dragon capsule into orbit this year.  These photos chronicle their recent training.