Astronauts risk kidney stones BBC

Kidney stones could prove to be the “final frontier” astronauts embarking on long distance missions have to tackle. Scientists say they must find ways of preventing space travellers developing the stones on long trips, such as missions to Mars. Studies on crews from the Mir space station found their chances of getting kidney stones were greatly enhanced. Affected astronauts could become incapacitated, and missions may have to be aborted.