Alan Friedman captured this image on September 7, 2014, using a PGR Grasshopper Express 6 megapixel camera and a 90mm Coronado calcium-K telescope (provided courtesy of Dennis Zywiczynski). Friedman inverted the tonality of the sun's surface so that the cooler regions appear lighter and the hotter regions darker. (http://www.sciencefriday.com/articles/picture-of-the-week-the-sun/?series=31)
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