How would humans react on a smaller planet than earth?

Answer 1

Assuming the planet was just like Earth in every other way...

First, the planet would have to be large enough to have enough gravity to sustain

an atmosphere, or it would be impossible for a human to survive.

As long as the planet had enough atmospheric pressure, then a human could survive, but their bones would slowly degenerate because when there is someone is not subjected to enough gravity, the bones become weaker.