Skylab II
 Skylab II is a space station concept proposed by the Advanced Concepts Office of NASA Marshall Space Flight Center to be located at the Earth-Moon L2 Lagrangian point. Proposed by NASA contractor Brand Griffin Skylab II would be constructed as a dry workshop using the upper-stage hydrogen fuel tank from the Space Launch System (SLS) much as the original Skylab was built from the fuel tanks of the Saturn S-IVB upper stage.