What causes a Sundog Rainbow? , What do you call a full circle rainbow? , What do you call a rainbow around the sun? , What does a rainbow circle around the sun mean? , What is Sundog phenomenon?
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A corona is a aura of plasma that surrounds the sun and other celestial bodies. The sun’s corona extends millions of kilometers in space and is generally seen on solar eclipse. The word ‘corona’ means ‘crown’.
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Watch this video on Corona