The Solar Impulse HB-SIA, which has 12,000 solar cells built into its 64.3-meter (193-foot) wings, is a prototype for an aircraft that its creators hope will carry out its first circumnavigation of the globe from 2012.
Ground staff prepare the solar-powered HB-SIA Solar Impulse prototype aircraft before a test flight at Payerne airport early morning April 18, 2011.
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