With a fresh crew now aboard the International Space Station, the four fliers they are replacing — including long-delayed Starliner astronauts Barry "Butch" Wilmore and Sunita Williams — undocked early Tuesday for a long-awaited return to Earth,

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.

The Starliner crew was originally meant to stay on board the ISS for a week, but issues with Boeing's Starliner spacecraft severely delayed their return to Earth.