the reality is that a major obstacle to an astronaut's health remains: bone loss in zero gravity. The primarily male study group lost a monthly average of about 1% of their exterior hipbone, about 2.5 ...

NASA astronauts, Suni Williams and Butch Wilmore, have been stuck on the International Space Center for almost 8 months.

During long space missions, microgravity takes a toll on astronauts' bodies, causing significant muscle and bone deterioration. For every month in space, astronauts' weight-bearing bones become ...