Originally scheduled for a short mission, astronauts Sunita Williams and Butch Wilmore have been stranded in space for over eight months. They launched aboard Boeing’s new Starliner capsule last June for what was meant to be a one-week test flight. However, their return was delayed due to technical issues with the spacecraft.

NASA astronauts Suni Williams and Butch Wilmore, station Commander and Flight Engineer respectively, are cleaning up following the Jan. 30 spacewalk to remove radio communications hardware.

Prolonged exposure to microgravity leads to various physiological changes, including muscle atrophy and a decrease in bone density