Elon Musk took to X on Sunday to tell people that if they vote for Donald Trump, he’ll take them to Mars within several years—and if they vote for Kamala Harris, they can kiss a trip to outer space goodbye. (And humanity as well, but it’s the outer space stuff that’s important here.)

The first reason is Elon Musk, whose singular vision and hard-driving leadership propelled SpaceX through its many ups and downs. It was Musk, for example, who pushed relentlessly for SpaceX to master reusable rockets, despite industry doubters and the grumblings of his own engineers.