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Microgravity also distorts the vestibular system, which is how you balance and sense which way is up.

Try looking at a spot far away and focusing on it, Duyka said, which “can often help what we call the vestibular system — or your balance system — settle down.”

Only in this case, that mismatched perception is a result of the organs and hairs of the vestibular system floating free without their usual gravitational signals.

For me, this event preceded a lifetime of work studying the vestibular system, which are the inner ear and brain structures and functions that allow you to remain oriented and stable in space.

The feelings it generates disrupt the vestibular system, which senses changes in motion, orientation, position and the speed of the body.