Musk’s SpaceX Goals Shift Ahead of Its I.P.O.

For years, SpaceX’s mission was clear: Get humans to Mars.“The most powerful thing we could do is establish a second, self-sustaining civilization outside of Earth,” Elon Musk, SpaceX’s chief executive, told Forbes in 2003, a year after founding the company. “And the only place that’s really feasible is Mars.”As a reminder of that goal, SpaceX has a mural in a cafe at its Hawthorne, Calif., campus featuring the…