evolution breakoff is a possible affect of space colonization.
The term evolution breakoff is meant to describe the splitting of the human race into subspecies.
This could happen because we evolved to survive on earth. But as we move on to other planets or moons we develop traits that are desirable to fit the survival needs on that planet or moon.
EX:
people on Lunar have weaker bones because of gravity
people at cold places like Europa or Neptune develop fur