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merge to comet
{{merge|comet}}
A '''Coma''' is a spherical cloud of material surrounding the head of a [[comet]]. This material is mostly gas that the Sun has caused to boil off the comet's icy nucleus. This gas shines both by reflected sunlight and light emitted by excited molecules. A cometary coma can extend up to a million miles from the nucleus.
A '''Coma''' is a spherical cloud of material surrounding the head of a [[comet]]. This material is mostly gas that the Sun has caused to boil off the comet's icy nucleus. This gas shines both by reflected sunlight and light emitted by excited molecules. A cometary coma can extend up to a million miles from the nucleus.