AUVSI: Imagine a featherweight aircraft built of composites boasting an enormous 160 foot wing, swathed in solar cells that can take off at 20 mph and remain aloft for five years.

Yes, five years. The plane would fly at 65,000 feet, above most air traffic aside from the odd U-2 zooming past. It would, without a doubt, be the loneliest plane in history.

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