The Pentagon has revealed plans for a surveillance aircraft that will fly more than 12 miles above the ground for 10 years without landing. Is this just a flight of fancy or a real possibility?

The 450ft-long (137-metre) craft will be developed at a cost of 400m USD, with a prototype one-third of that length due to be ready by 2014.

The US military hopes the blimp, floating 12 miles above a surveillance area in near space, will give it a better understanding of events on the ground. It will be equipped with a radar system able to provide unprecedented detail over a wide area from hundreds of miles away. The craft - called Isis - will be powered by hydrogen fuel cells recharged by its own solar panels, and will be filled with helium, which will give the craft its shape.

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