Without the earth's gravity to help the sensory systems in our ears and brain, astronauts in space can also feel dizzy. In fact, the sensation feels like constantly falling… like when you ride in an elevator or on a roller coaster.
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The injuries come from hitting heads on the ceiling or being thrown around in the aisle like a rag doll. If you're seated with your belt on, it's like a roller coaster ride and nothing worse. Remember that I said it's rare, not unheard of, for turbulence to bring airplanes down.