On Friday, when SpaceX filed plans with the FCC for a million-satellite data center network , you might have thought Elon Musk was having a bit of fun with us. But a week later, it is clear that he is dead serious.  The most obvious step, of course, is the formal merger between SpaceX and xAI that went forward on Monday , officially drawing together Musk’s space and AI ventures in a way that makes a lot more sense if there’s some kind of joint infrastructure project planned. But even beyond the