A complex group of sunspots, known as Active Region 10030. Sunspots are caused by powerful magnetic force-fields, which hamper convection and are up to 7,000 degrees Fahrenheit cooler than the Sun?s surface, which is typically about 9,944 degrees.
Credit: Royal Swedish Academy of Sciences/ Goran Scharmer, ISP/Mats Lofdahl, ISP/Michael Benson/Kinetikon Pictures
Source: http://www.nytimes.com/slideshow/2012/12/11/science/SCIBOOKS.html?partner=rss&emc=rss
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