>>16699559This is one of the themes of ringworld, a classic sci fi book. Basically, a civilization made a ringworld (used all the planets in a solar system to make a ring 1m miles wide and 600 m miles long. So it’s got 3 million times the surface area of earth. And then evolution happens and all the humans on it evolve a little differently until they’re separate species (can’t have children together) but still have semi technological civilization. The different evolutions each take an ecological niche (because there are no other big animals on the ringworld) like grass eating (cow-like) corpse eating(vulture-like), etc.
Yes, all the memes about aliens in starwars or startrek that are basically humans but green or with horns or whatever is much more feasible than you might initially think once you consider
panspermia/genetic divergence
>>16697358