2 NASA astronauts head back to Earth after an unexpectedly long mission in space

This image taken from NASA video shows the SpaceX capsule carrying NASA astronauts Suni Williams, Butch Wilmore and Nick Hague as well as Russian cosmonaut Aleksandr Gorbunov after it undocked from the International Space Station on Tuesday.

NASA astronauts Suni Williams and Butch Wilmore were on the International Space Station more than nine months, despite launching into space in June for what was expected to be an eight-day mission.

(Image credit: NASA)