I am thinking of evolution of human beings as a species. If we were to stablish a colony on, for example, Mars, how would the lower gravity affect future generations of humans living there? Is there any possibility that the lower gravity caused biological changes that would lead us to separate into two different species? (given the sufficient time)
I'm not asking what would happen if Martians went back to Earth, or how life would be different in a low gravity planet, I'm asking if we could split into two different species after enough time in a planet with lower gravity.