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Unformatted text preview: Ocean. The challenge to fly a solar plane around the world was officially announced in 2003. This is a very good invention. Airplanes that can use the sun for energy are important in helping the ecosystem by using less fuel for planes. I hope that solar planes can become better, and eventually replace planes that use fuel. But, I think the cost is expensive, so it will take a long time to make solar airplanes useable....
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- Spring '11