Positioning, navigation and timing satellite systems have come a long way since the U.S. military launched the first Navigation System with Timing and Ranging spacecraft in 1978. GPS alone now supports more than $70 billion in services. China and the EU are close to completing their own constellations, and the UK is considering an independent system as it prepares to leave the EU. NASA, meanwhile, is taking an otherworldly approach—making plans for a navigation system on the Moon and ...


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