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.

NASA astronauts Butch Wilmore and Suni Williams are finally back on Earth, nearly 9 months later than originally scheduled, splashing down in a different spacecraft than the one they launched in last June.

NASA astronauts Butch Wilmore and Suni Williams are set to splash down on Earth on Tuesday evening after spending more than nine months in space.