The first people born on another world may learn to move differently.
A child’s bones, muscles, balance system, and brain develop while constantly learning how to work with gravity.
The Moon has only about one-sixth of Earth’s gravity. Mars has a little more than one-third.
We do not yet know how growing up in those environments would affect a human body.
Before humans can truly become a spacefaring species, we may need to understand something we have never studied directly:
How does a child grow without Earth’s gravity?