Elon Musk just became the first person ever worth $800 billion or more after his rocket maker SpaceX acquired his artificial intelligence and social media company xAI.

Starbase, the company town that Elon Musk’s SpaceX created in South Texas, is forming its own police squad.

The two companies announced the deal on Monday in a statement on SpaceX’s website, saying the merger would form “the most ambitious, vertically-integrated innovation engine on (and off) Earth, with AI...