Shellworld © 2013 Debbie HughesIllustration for Kenneth I. Roy, Robert G. Kennedy III, David E. Fields:
Shell Worlds: An Approach to Terraforming Moons, Small Planets, and Plutonoids
In this scenerio, a small planet is completely enclosed my material to enclose it in an earthlike atmosphere. The lower gravity would enable people to fly and cities to be built above ground. Lighting is provided that illuminates, provides warmth and helps plants to grow.