Imaginations worldwide—those fascinated by Musk, mega-finance, the next moves in technology, or all three—are fired up by the possibilities. So are bettors on prediction markets, though shares of Tesla and SpaceX rival EchoStar ( SATS) don't appear to reflect the the volume of Street gossip.

Investor Gary Black shared his doubts on a potential merger between Tesla and SpaceX, citing lack of mathematical and industrial logic.

Tech giants SpaceX and OpenAI are expected to go public in 2026. Here's what smart people in business and tech are saying.