Elon Musk has long framed SpaceX's mission in sweeping terms: to send humans to Mars and make humans interplanetary. Along the way, the moon has played an inconsistent supporting role. SpaceX is under contract with NASA, for example, to send people to the moon, and that funding plays a key role in some of SpaceX's major projects. However, Musk's main messaging for years has been to build cities on Mars, not the moon. On Sunday, that messaging seemed to take a hard 180. "For those unaware,