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Space travel can accelerate Alzheimer's: US study

October 30, 2012 image from the Mast Camera on NASA's Curiosity rover shows the upper portion of a wind-blown deposit dubbed "Rocknest" on the surface of Mars. Long journeys into deep space, including a mission to Mars, could expose astronauts to levels oLong journeys into deep space, including a mission to Mars, could expose astronauts to levels of cosmic radiation harmful to the brain and accelerate Alzheimer's disease, according to a US study.