As well as a shift in fluid causing their faces to puff, the microgravity in space would have also triggered muscle atrophy, a temporary height increase, a reduced bone density, blood flow problems, and a change in neurovestibular function - as per DD News.

NASA astronauts Suni Willaims and Butch Wilmore finally returned to Earth after 9 months in space. On March 19, they splashed down off the coast of Florida.