NASA to Begin Space Station Medical Evacuation: What to Know

Four astronauts are leaving the outpost 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.