SpaceX's board has approved a compensation plan for founder Elon Musk with goals as futuristic and celestial as the company's ambitions: colonizing Mars and running data centers in outer space. The details of Musk's sweeping pay package, which have not been widely reported, were revealed in the β€Œcompany's confidential registration statement filed in recent weeks with the Securities and Exchange Commission and reviewed by Reuters last week. The lofty rewards dangled for Musk by SpaceX β€Œshow the challenge of holding the attention of the serial entrepreneur as he prepares to take the rocket maker public.