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.

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