Outgoing space station commander Mike Fincke, a member of the returning Crew 11, turned the station over to cosmonaut Sergey Kud-Sverchkov, saying the combined crew had developed deep friendships.

The Crew-11 mission has left the International Space Station and have arrived back on Earth. Crew Dragon Endeavour and its crew of four — comprised of two NASA astronauts, one Japanese astronaut, and one Russian cosmonaut — splashed down in the Pacific Ocean at 12:40 AM PST (08:40 UTC) on Thursday, Jan. 15.

NASA and SpaceX are targeting no earlier than 5:05 p.m. EST, Wednesday, Jan. 14, for the undocking of the agency’s SpaceX Crew-11 mission.

Four astronauts with SpaceX Crew-11 are set to undock from the International Space Station to make their return to Earth. This planned departure comes after NASA announced that it postponed a spacewalk due to a crew member's medical situation.

Four astronauts returned to Earth early Thursday morning after leaving the International Space Station a month early because of a medical issue.

As NASA prepares to bring Crew-11 home early, here's a look at other medical issues or space emergencies that NASA has overcome.