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ISS study identifies thresholds for muscle atrophy and fiber changes in reduced gravity  Phys.orgNew Research on Muscle Loss Suggests Humans Will Really Suffer on Mars  Gizmodo24 mice launched to orbit in 2023. What happened to their bodies could help humans better survive in space  Scientific AmericanScientists alarmed by the number 0.67: the grim truth about gravity  Universe Space TechDo we have the muscle for Mars? | Newswise  Newswise