![Total solar eclipse. The delicately structured glow of the solar corona—or solar …[Credits : Copyright AURA Inc./National Optical Astronomy Observatories/National Science Foundation]](http://media-2.web.britannica.com/eb-media/26/126-004-EEF6FA74.jpg)
Total solar eclipse. The delicately structured glow of the solar corona—or solar atmosphere—seen during the March 7, 1970, total eclipse of the Sun. The corona is visible to the unaided eye only during an eclipse.
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