"Nine days: That's the longest any airplane has stayed in the air. Burt and Dick Rutan's Voyager
set the record in 1986 by flying 24,986 miles around the world without
refueling. But nine days of uninterrupted flight won't cut it for
Darpa, the Pentagon's advanced-research organization. It's challenged
the aviation industry to come up with an unmanned surveillance and
communications plane that can circle targets for half a decade — and do
so on nothing but solar power."
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