Medicine
Bone Density Loss in Astronauts Under Microgravity
Quick fact
Astronauts on the International Space Station can lose up to 1-2% of bone mass per month in weight-bearing bones like the hips and spine, which is more than what a postmenopausal woman loses in an entire year.
Why this is interesting
You know that astronauts float in space, looking weightless and free. But did you know that their bones are silently wasting away, losing density every single day?