Without the need to support body weight, muscles weaken over time, making it difficult for astronauts to walk properly upon returning to Earth. The heart doesn't have to work as hard to pump blood ...

and Butch Wilmore stand together for a photo enroute to the launch pad at Space Launch Complex Another factor that explains why astronauts find it difficult to walk, is fluid redistribution.

They are getting only a small fraction of the exercise we all get from just walking in gravity." Increased risk of cancer due to the heightened levels of radiation that astronauts are exposed to ...

Private Lunar Lander Is Declared Dead After Landing Sideways in a Crater Near the ... of rovers to roam the unexplored terrain ahead of astronauts' planned arrival later this decade.

Extended time in space can bring changes to human physiology and psychology. NASA astronauts Barry "Butch" Wilmore and Sunita "Suni" Williams are returning to Earth after spending an unplanned ...

A private lunar lander is no longer working after landing sideways in a crater near the ... of rovers to roam the unexplored terrain ahead of astronauts' planned arrival later this decade.

A private lunar lander is no longer working after landing sideways in a crater near the ... of rovers to roam the unexplored terrain ahead of astronauts’ planned arrival later this decade.