The microgravity that astronauts experience orbiting Earth on the space shuttle or International Space Station can ravage their bodies on lengthy missions, atrophying muscles, weakening bones and causing irregular heartbeats.
To advance longer and farther into space, researchers want to curtail these risks.
By analysing the effects of weightlessness on the cellular level, scientists in Australia now believe they have pinpointed the roots of its harmful consequences.
Microgravity apparently tampers with stem cells, which all other cells originate from. Stem cells normally act as a repair system for the body by replenishing its tissues.
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