As US astronauts Butch Wilmore and Sunita Williams prepare to return home after nine months aboard the International Space Station (ISS), some of the health risks they have faced are well-documented ...

While Sunita Williams and Butch Wilmore eagerly await their return to Earth, they are likely to face physical complications ...

Bone and muscle deterioration, radiation exposure, vision impairment -- these are just a few of the challenges space ...

According to NASA, astronauts experience a loss of bone density and muscle atrophy ... as Spaceflight Associated Neuro-ocular Syndrome (SANS). The heart in space changes from an oval shape ...