Pathfinder 1 looks like a blimp, but much bigger. It's part of a wave of interest in "lighter-than-air" or LTA aircraft.
The Cool Down on MSN
Scientists stunned after unlocking secret to powering airplanes of the future: 'Deserving our attention'
"There is a wealth of [it]." Scientists stunned after unlocking secret to powering airplanes of the future: 'Deserving our ...
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