Butch Wilmore and Suni Williams, two veteran NASA astronauts who have been stuck on the International Space Station for nine months, are scheduled to begin their return to Earth early on Tuesday morning on a long-awaited flight home to cap an unusual mission.

Astronauts Suni Williams and Butch Wilmore, who have been stranded at the International Space Station for nine months, will finally return to Earth on Tuesday, one day earlier than expected.