The appeal of an inner solar system would be the Dyson swarm surrounding the star, powering a Jupiter-sized matryoshka brain. But most of humanity would live in the vastness between the stars: taking a sun with us in the form of portable fusion power, and making a home among the trillions of Kuiper belt and Oort cloud objects between the stars. Hopping from rock to rock, sprouting villages, towns, and cities with each step an blossoming humanity into uncountable many descendant civilizations.