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Coma

13:31

A Comet With a Coma Five Times Greater than Jupiter is Approaching the Earth

8:41

Introduction to Comets - How They Form and How Comets Work

3:46

The man woke up from a 19-year coma and What he told disturbed everyone

3:19

HUGE ASTEROID CAPTURED IN COMET ISON'S COMA ???

3:44

Less Than Five - What's the Difference Between Comets, Asteroids, Meteoroids, Meteors & Meteorites?

The coma is the nebulous envelope around the nucleus of a comet, formed when the comet passes close to the Sun on its highly elliptical orbit; as the comet warms, parts of it sublime. This gives a comet a "fuzzy" appearance when viewed in telescopes and distinguishes it from stars. The word coma comes from the Greek "kome" (κόμη), which means "hair" and is the origin of the word comet itself.
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