In recent months, NASA astronauts who have spent extended periods aboard the International Space Station (ISS) have been under the microscope as scientists continue to study the long-term health effects of living in space.

Despite the extended mission and the added risks of staying in space far beyond the original plan, neither Williams nor Wilmore will receive any overtime or hazard pay for their additional time in orbit.

After nine months on the International Space Station, NASA astronauts Sunita Williams and Barry “Butch” Wilmore splashed down in the Gulf of Mexico on March 18.