SpaceX’s broadband satellite internet, Starlink, is still in beta, but already has over 10,000 customers. The fledgling service is expected to be a cash cow for SpaceX, bringing in as much as $30 billion a year — more than 10 times the annual revenue of its existing rocket business. This revenue will be used to fuel Elon Musk’s ultimate goal of building a colony on Mars. Eventually, Starlink may even keep us connected on the Red Planet. Elon Musk’s SpaceX rolled out its Starlink early access program to the public six months ago, with the satellite internet service growing to more than 10,000 users in the first few months.