From left, the astronauts Oleg Platonov of Roscosmos, Michael Fincke and Zena Cardman of NASA and Kimiya Yui of JAXA, the Japanese space agency, inside a Crew Dragon capsule just after splashing down.
Four astronauts departed from the I.S.S. about a month earlier than scheduled because a crew member, who was not identified, has an undisclosed medical issue.
The International Space Station crew members in their Crew Dragon pressure suits on Jan. 9. Clockwise from bottom left: NASA astronaut Mike Fincke, Roscosmos cosmonaut Oleg Platonov, NASA astronaut Zena Cardman and JAXA astronaut Kimiya Yui.