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6 of 12 from X-37B: The space plane of mystery (pictures)
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Power for the X-37B while it's in orbit comes from the sun. The Air Force says the space plane is equipped with gallium arsenide solar cells and lithium ion batteries. This artist's rendering is from 2003, back when the X-37, as yet unbuilt, was still in NASA's hands (PDF).
June 16, 2012 12:55 PM PDT
Photo by: NASA
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