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A mosaic of the extreme ultraviolet images of the sun captured from NASA's STEREO telescope taken on December 4, 2006. These false color images show the sun's atmospheres at a range of different temperatures. Clockwise from top left: 1 million degrees Centigrade ,1.5 million Centigrade, 60,000-80,000 Centigrade, and 2.5 million Centigrade. [Reuters]
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