The International Space Station (ISS) is almost the size of a football field. It serves as a laboratory and living space for astronauts, including Sunita Williams and Butch Wilmore, who spent 9 months aboard stranded.

Months in space cause muscle loss, fluid shifts, kidney stones, vision issues, and balance problems after returning to gravity.

Nasa astronauts Butch Wilmore and Suni Williams have finally left the International Space Station (ISS) after an unexpected nine-month stay. Theirs has been one of the most controversial and high-profile stays on the station after the Boeing Starliner spacecraft they arrived on was deemed unsafe to be manned back to Earth.