Cost of space travel: Sunita Williams, Barry Wilmore aged slower in space, but Earth's gravity could hit them hard on return
Beyond aging, space travel triggers other biological changes. NASA’s famous twins study compared astronaut Scott Kelly, who ...
US Astronauts Stuck in Orbit for Months Finally Set to Come Home
After more than nine months in space, relentless media coverage and a political firestorm, two NASA astronauts who captured ...