Imagine a fleet of drones, overhead, out of sight, tens of thousands of feet in the sky. Imagine those drones being powered by sunlight — effectively aerial satellites that are orbiting constantly, never having to touch down for fuel. Now imagine thousands of them, perhaps tens of thousands of them, with cameras and radio repeaters on board. Such a fleet could image everything, all the time, everywhere, at high-resolution. They could also provide low-cost communications — effectively cellphone towers 60,000 feet tall. …
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