India, May 2 -- Four astronauts splashed down safely in the Gulf of Mexico Sunday, completing NASA's first commercial crew, long-duration mission aboard the International Space Station. The return comes nearly six months after the crew members arrived at the microgravity laboratory and also marks the longest-duration mission of a crewed American spacecraft to date.

SpaceX's Crew Dragon, carrying NASA astronauts Michael Hopkins, Victor Glover, and Shannon Walker, and Japan Aerospace Exploration Agency astronaut Soichi Noguchi, returned to Earth in a parachute-assisted splashdown at 2:56 a.m. EDT off the coast of Panama City, Florida. Crews aboard SpaceX recovery vessels successfully recovered the spacecraft and astronauts. After returning...