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.

Butch Wilmore and Suni Williams are heading home after about nine months at the International Space Station. The two veteran NASA astronauts were only supposed to be in space for a little more than a week.

Two US astronauts have begun their journey back to Earth after being stranded on the International Space Station (ISS) for more than nine months due to a technical fault with their spacecraft. The two astronauts,