Musk first announced his intention to build a space-based internet, which he would eventually call Starlink, in January 2015. He had plans to settle Mars, then the moons of Jupiter, and maybe asteroids too. All those space colonies would have to be connected via satellite-based communication; Starlink itself might one day be adapted for this use. Indeed, Starlink’s terms of service ask customers to affirm that they “recognize Mars as a free planet and that no Earth-based government has authority or sovereignty over Martian activities.”

Musk is clearly imagining a future in which neither his network nor his will can be restrained by the people of this world. But even now, here on Earth, space internet is a big business. Fiber networks cannot extend to every bit of dry land on the planet, and they certainly can’t reach airborne or seaborne vessels. More than 5 million people have already signed up for Starlink, and it is growing rapidly. (You may end up using Starlink when you fly United, for example.) In the not-too-distant future, an expanded version of this system—or one very much like it—could overtake broadband as the internet’s backbone. A decade or two from now, it could be among our most crucial information infrastructure.