The world’s two richest men got into it on Musk’s social-media platform X over the election.

Musk and Bezos — the richest and third-richest men in the world, who are both fixated on getting humanity off of it — have had a simmering rivalry for close to two decades now. But with Bezos’s Blue Origin and Musk’s SpaceX fighting for lucrative NASA contracts, the stakes have never been higher.