When astronauts Sunita Williams and Barry Wilmore return to Earth Tuesday after spending nine months on the International Space Station, their bodies will have undergone significant changes. The SpaceX capsule carrying the astronauts is expected to splash down off the Florida coast just before 6 p.

From a spacecraft’s coolant leak to the disintegration of the Soviet Union, astronauts have gotten stuck in space for a variety of reasons over the decades of human spaceflight.