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Celestial sphere definition, the imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer's position. See more.
Corona. A corona is a type of plasma of the Sun or other celestial body, extending millions of kilometres into space, most easily seen during a total solar eclipse, but also observable in a coronagraph. The word corona itself derived from the Latin, meaning crown, which in turn came from the Ancient Greek ÎºÎ¿ÏÏÎ½Î· meaning garland or wreath.