SpaceX president Gwynne Shotwell said the two companies are working towards the same goal, and didn't rule out a merger with Tesla in the future.

Punters on prediction markets are ramping up bets that Elon Musk may eventually combine Tesla Inc.

On its first day public, SpaceX floated folding in Tesla and a former director called it likely. Here is why the SpaceX-Tesla merger talk is serious.