Why do astronauts grow taller when they return from space? After looking at the reasons behind, netizens, the cost is too high.

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Someone once discovered that astronauts in the mysterious environment of space, only a few weeks later, but they grew several centimeters taller. It's really strange, I have to say. In recent years, with the gradual development of our science and technology and the progress of medical treatment in all aspects, some astronauts who enter space and the country then go to their bodies for careful observation. It was discovered that these people would always come back to the earth with some serious illnesses. What is the reason?