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What is the corona of the sun?

If you see the photograph of the sun during a total eclipse, you can see an uneven glow of light all around the eclipsed sun. This is called the Corona. The surface of the sun is not solid but is composed of hot gases. In fact, the sun is surrounded by four layers of gaseous matter that hide what is underneath. The outermost layer is called the Corona. The next three are known as the chromosphere, the reversing layer, and the photosphere. The chromosphere or the colour sphere is about nine thousand miles thick and is made u mostly of hydrogen and helium gases. At the time of a total eclipse, it shines around the dark disc with a brilliant scarlet light. From this red border, flame-coloured clouds of the same material shoot out to great distance, sometimes even as long as a million miles. They look like huge irregular flames of fire. The outermost layer or the Corona is made of light, gaseous matter. It is two-part. The inner one, close to the red chromosphere is a band of pale yellow. The outer one is white, with streamers extending out millions of miles. It is normally difficult to see and study the sun and its layers. The best time to photograph and see the Corona and the chromosphere is the time of a total eclipse.

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