Billions of rotating habitats will add to millions of times Earth’s surface, providing comfortable living to quintillions of human beings. Just like building a campfire, we start small—with resources from mining asteroids, the moon, and mercury. The entire world’s population could be lavishly housed in less than 400 of these habitats.
The sun not only releases unmeasurable amounts of free energy, it also a contains more than enough construction materials to build an entire Dyson swarm—and they might be easier to extract than we think. For more details you can check the spoilers section, or start reading K3+