Floating around in microgravity inside a spacecraft might look like fun, but it can do nasty things to your body. With the current enthusiasm for crewed space flight and particularly NASA's plan to send astronauts to Mars, there is a need to find ways to counteract the damaging effects of a lack of gravity. Without Earth's gravity, astronauts lose their hand-eye coordination and as the days go by they suffer a steady loss of red blood cells and deterioration of bones and muscle, including the heart.
展开▼
