Solar powered plane flies through the night

A plane powered entirely by the sun that flies at night. It sounds improbable, but Solar Impulse has just proven that it can be done. Following on from its maiden flight in April, the solar plane flew through the night in the skies above Switzerland this week, passing another important milestone on a journey that has already lasted seven years and is set to culminate in an attempt to fly around the world non-stop in 2012.

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