Astronauts can grow a few centimeters taller in space
Without Earth’s constant downward pull, spinal discs expand and the backbone lengthens a little — so astronauts often measure a few centimeters taller after weeks in microgravity.
The stretch is temporary. Back on the ground, gravity compresses the spine again, and height mostly returns. Crews also work hard against muscle and bone loss with daily exercise.
Bodies keep a diary of gravity. Even a short orbital stay rewrites posture, fluid balance, and the centimeter marks on a clinic chart.
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