Asteroids: - create whatever level g you want - create whatever day-night cycle you want - create whatever atmosphere and temperature range you want - creat

Asteroids: - create whatever level g you want - create whatever day-night cycle you want - create whatever atmosphere and temperature range you want - create as much surface area as you want, potentially millions of Earth's worth - no need to terraform: build the habitat you want from the start - solar power continuously available - wide variety of mineral deposits available - plenty of water available