Last updated on April 21, 2014 at 5:21 EDT
Gradient Sun
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Gradient Sun

December 27, 2012
The image on the left shows the sun on Feb. 24, 2011 as observed by NASA's Solar Dynamics Observatory. The image shows light emitted by million degree plasma, a temperature that is particularly good at highlighting fine arcs in the sun's atmosphere called coronal loops.

Credits: NASA/A. Young