NASA astronauts are returning to Earth after nine months in space. Experts have said a prolonged period in space can come with changes to human physiology and psychology.

As NASA astronauts Butch Wilmore and Suni Williams return to Earth after an unplanned nine months in space, here's how they spent their time.

Astronauts Suni Williams and Butch Wilmore made splashdown on Earth on Tuesday after spending nine months in space. A SpaceX crew with replacements for the two astronauts arrived at the