Edge of the Verse
“Earth-That-Was couldn’t handle the growing population and resource needs of humankind. Amazingly enough, instead of wiping itself out, the human race rose to the challenge of finding a new home for the species. A nearby star was located, home to dozens of planets and hundreds of moons, almost all of which had enough mass and solidity to be templates for new earths. Through giant atmosphere processing plants, terraforming technologies, gravity regulation and the introduction of every known form of Earthlife, each planet became its own little (or in some cases, huge) Earth. Every person willing and able to leave the Earth migrated to the new system.”
- A Brief History of the Universe circa 2507 A.D.