Luna

Description
An early source of helium-3, Luna is now mined for materials used in space habitat construction. Two dozen major stations have been constructed at Earth's L4 and L5 Lagrange points, all from lunar resources.

Trivia

 * The presence of the CCCP Luna 23 probe allows the operational zone to be established as the southern portion of Mare Crisium.
 * At the beginning of the novel Mass Effect: Revelation, it is stated that Luna was "terraformed." This is not physically possible, as Luna does not have sufficient mass to gravitationally retain an Earth-like atmosphere. As a compromise, the official position is that several of the moon's craters were "domed over," allowing localized terraforming of the surface.
 * When looking at Earth from the surface of Luna, a reversed image of North America (Mexico, U.S. West Coast) can be seen.