As the duration of space flight missions has increased, many other symptoms related in particular to being away from gravity have been observed. They include a

As the duration of space flight missions has increased, many other symptoms related in particular to being away from gravity have been observed. They include a kind of anemia due to reduced red cell mass, muscle atrophy and reduced strength of those muscles that keep the body upright, loss of calcium from bones, reduced bone density and strength, reduced calcium absorption from the gut, disturbed sleep and a depressed immune system. These are all normal body function adaptations that occur when away from gravity. Degradation of body functions no longer needed in space is the normal adaptation to living away from gravity. OK, these are pretty bad, but they're not literally cancer. My space-age dreams live on.