In this artist's concept of future lunar operations, a lunar ferry is about to burn out of lunar orbit for the trip back to facilities in low Earth orbit. The ferry vehicle carries tank modules filled with liquid oxygen, which has been produced from mining operations on the surface of the Moon. One possibility for such operations would be to have manned facilities in low lunar orbit, such as illustrated here. At the upper right side of the photo is a small orbiting manned station. At the lower right side of the photo is a liquid oxygen propellant dump, to which a lunar landing vehicle carrying liquid oxygen is about to dock. The lunar ferry vehicle itself is representative of one type of aerobraking system. The balloon-like torus around the center of the ferry-craft would inflate to several times its illustrated size and, once the vehicle has swooped down close to the Earth's outer atmosphere on the return journey, would use atmospheric drag to slow the craft and place itself in low Earth orbit. The liquid oxygen would then be used in operations there for fueling various vehicles, including an orbital transfer vehicle for trips to geosynchronous Earth orbit.