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Image of a sunspot, taken by NASA's Transition Region and Coronal Explorer (TRACE) in Sept. 2000
This image of a sunspot, taken by NASA's Transition Region and Coronal Explorer (TRACE) in Sept. 2000, showing the bright emission of the gas at about 1 million degrees, with the cooler material around 10,000 degrees showing up as dark, absorbing structures. Credit: NASA/TRACE

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