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It is not pretty to pull a muscle or even lose your bones in the outer space. However, astronauts actually become taller when they are in outer space. NASA’s astronaut Scott Kelly was about 2 inches taller when he returned to Earth after his year long stay at the International Space Station earlier this week. This growth was experienced following a year of weightless suspension in a tin can.
The concept behind all this is that the spine of a person actually elongates in weightlessness once it is free from gravity. In case you were wondering, the height gain is temporary and Kelly will shrink back to normal soon. This can only be possible if he had experienced some sort of mutation during his stay on space. Height improvement may soon become a service offered by future space tourism industry otherwise.