When The Heavens Went On Sale

In 2008, Elon Musk's SpaceX became the first private company to build a low-cost rocket that could reach orbit. Suddenly Silicon Valley, not NASA, was the epicentre of the new Space Age. Ashlee Vance follows four pioneering companies - Astra, Firefly, Planet Labs and Rocket Lab - as they race to control access to outer space. While the space tourism ambitions of billionaires such as Bezos and Branson make headlines, these under-the-radar companies are striving to monetise Earth