Possible Human Evolution
I am working on a series set in Alpha Centauri where (in the universe) there are 4 main habitable worlds and a couple that have protected surface dwellings. As well, there are hundreds, if not thousands, of artificial habitats floating around both stars.
Background on the world:
In the mid 2100s, a colony fleet left for a 180 year journey from Earth to aCen with 800,000 people. The basic ethnic makeup was similar to the average makeup of Earth. The main story takes place in mid 2700. Throughout that time, millions of people have come on thousands of other colony ships, especially after it became faster and cheaper to do so.
Now, at the system, the main habitats are the 4 Earth-like planets with gravitational strengths that range from 0.9g to 1.2g. The orbital colonies keep it at 1g because they can. The orbital colonies vary between inner and outer so they receive varying amount of stellar light and radiation.
Between the current trend of human evolution and then the trip across interstellar space, followed by living on several types of habitats; what are the possible future "ethnicity types"? Meaning, would everyone look the same like in the movie Cloud Atlas, would they look the same as now? A long answer could breakdown how a people might evolve on each of the habitat types; however other good answers could provide information on how certain features (star-type, gravity strength, atmospheric pressure, atmospheric composition [while being breathable] could affect the development of humans over the course of a few hundred years.
- Human ethnic and racial barriers have been more or less broken and marriages are random.
- Humans originally selected were genetically screened and only the best candidates were selected.
- The system population is around 30,000,000,000 people.