JOHN CHUMACK / SCIENCE PHOTO LIBRARY JOHN CHUMACK / SCIENCE PHOTO LIBRARY
Close-up of the solar surface, showing a large filament; August 11, 2013. Photographed in hydrogen-alpha light with a DMK 21 AF04 firewire camera & Lunt 60mm/50HA solar telescope, 723 frames, 1/77 sec exposure.
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