Elon Musk's AI company xAI, which includes Elon Musk's social media platform X, has just been acquired by Elon Musk's space company SpaceX.

Musk wrote that the merger of SpaceX and xAI will ‘form the most ambitious, vertically-integrated innovation engine on (and off) Earth.’

Musk is combining rocket maker SpaceX with his AI startup, the largest tie-up in his expansive business portfolio.

Billionaire folds rocket maker into a lossmaking AI start-up, betting scale and control can beat rivals to blockbuster IPO

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. Forbes estimates that the deal, which values the combined company at $1.25 trillion, boosted Musk’s fortune by $84 billion, to a record $852 billion.

Musk's memo announcing SpaceX and xAI's merger is full of space jargon. Here's your cheat sheet to bring the wonky language back down to Earth.

The revelations that Musk sought an invite to Epstein’s island add risk to his plans to merge SpaceX with xAI, and then take the combined company public, experts say.