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Jun. 03, 2011
Solar Spotting

Using the Swedish Solar Telescope, a ground-based observatory, Goran Scharmer and colleagues probe the penumbra--that's the stringy structure around the perimeter of the dark part of the sunspot. The images give scientists new insight into how that structure forms.
images: NASA/SDO, Institute for Solar Physics of the Royal Swedish Academy of Sciences. AAAS/Science. music by Malloc Baldwin


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