SpaceX’s dream for a million data centers in space is veering closer to reality than science fiction. On May 29, the company submitted a filing to the Federal Communications Commission that answered questions about its plan. Ten days later, Elon Musk, the chief executive of SpaceX, sat down for a video interview posted on his social media platform, X, to offer even more details. “Space is really big. It’s not like space is going to get crowded,” Musk said.