Roots of Huge Solar Explosions May Lie in 'Coronal Cavities'

SPACE.com
Roots of Huge Solar Explosions May Lie in 'Coronal Cavities'
The faint oval above the upper left limb of the sun in this picture is known as a coronal cavity. One of NASA’s twin Solar and Terrestrial Relations Observatory (STEREO) spacecraft captured this image on Aug. 9, 2007.
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