Page last updated at 05:25 GMT, Wednesday, 14 April 2010 06:25 UK

Nasa's new unmanned drone for environmental research

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Nasa has successfully started flying unmanned aircraft to carry out environmental research.

The space agency has acquired three Global Hawk drones from the United States Air Force.

They're designed to fly at very high altitudes for extended periods of time.

Peter Bowes has been to see one the planes, in its hangar at Nasa's Dryden Flight Research Centre in California's Mojave Desert.

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