Suni Williams and Butch Wilmore are gearing up to return toE Earth on Tuesday after an unexpected nine months aboard the ISS, and experts are sharing a number of health effects the pair might experience when they re-enter Earth's atmosphere.

Two NASA astronauts have safely returned to Earth after an extended trip to the International Space Station. Sunita Williams and Butch Wilmore splashed down off the coast of Florida on Tuesday just before 6 p.m. All four members aboard the Dragon capsule were seen smiling as they were carried away on stretchers for medical checks.

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.