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Solar Powered Plane Lifts Off on World Tour

A solar-powered Swiss airplane took off from Abu Dhabi early Monday on the first leg of what its creators hope will be the first around-the-world journey without any fuel. The carbon fiber single-seater Solar Impulse 2 aircraft has a 72-meter wingspan, which is longer than the wingspan of a Boeing 747, and weighs about as much as a car. The 17,000 solar cells built into the wings harness the sun's energy, allowing it to fly through the night. The Si2 took 12 years to build and is...

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