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How Spaceflight Changes the Human Body

The biggest-ever study of astronaut health during spaceflight gives clues on what to look for in future long-haul space missions.

It’s no secret that spaceflight does some unexplainable things to astronauts’ bodies. The NASA Twins Study revealed that in a confined capsule under microgravity and prolonged exposure to radiation, the human body goes through many changes. The immune system is compromised, the eye changes shape, muscle and bone mass is significantly reduced.

It also showed that there were changes in the gut microbiome, cognitive abilities slowed down, and certain genes would turn off and on. They also found that chromosomes experienced structural changes.

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