Imagine the first human spaceship capable of close-to-light-speed returning from a ten-year mission to explore nearby star-systems. A side-effect of close-to-light-speed travel no one had considered had been described by Albert Einstein a hundred years before. At speeds close to the speed of light time is distorted, so a decade in Ship Time became a century back home. In that century a meteor had pushed Earth closer to the sun, destroying the human civilization in the process. So the Earth found by the crew was more like it had been 100,000BCE, three colonies would be established: Alpha Colony was build outside New York Bravo Colony chose a spot near London Charlie Colony went home to Scandinavia From these three colonies would rise a new and powerful civilization.