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Total solar eclipse, corona at totality
Total solar eclipse. Sun's corona seen at the moment of totality during a total solar eclipse. The corona is a cloud of low-density plasma (hot ions) surrounding the Sun. Normally it is not visible, being obscured by the brightness of the Sun's visible surface, but it is revealed during a total solar eclipse, which occurs when the Moon blocks the light from the rest of the Sun. This moment of totality lasts for only a few minutes. Total solar eclipses usually occur less than once a year, and can only be seen from a small area of the Earth's surface. Photographed on 21 June 2001, in Sumbe, Angola.
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