Coma (Astronomy)

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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.

Sources[edit]

APOD Glossary

Categories: [Astronomy]

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