JOHN CHUMACK / SCIENCE PHOTO LIBRARY JOHN CHUMACK / SCIENCE PHOTO LIBRARY
Close-up of the surface of the sun, including a sunspot, seen in hydrogen-alpha light on April 2, 2013. Photographed with a Lunt solar LS60 scope/LS50 hydrogen alpha solar filter; ASI120MM camera, 1/387 sec exposure, 724 frames.
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