Why do astronauts grow an inch in space?

– Xochielt Sanchez

Answer by Robert Frost:

In microgravity the spine elongates 1-2% because there is no longer axial loading pushing down, compressing the spine.  The spacing between each vertebrae increases slightly, resulting in a longer spine and thus a taller astronaut.  The downside is that the stretching of the ligaments can cause spasmodic back pain.

Why do astronauts grow an inch in space?

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