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A green comet is a celestial object that appears to be green in color when viewed from Earth.

The green color is due to the presence of cyanogen and diatomic carbon in the coma and tail of the comet.

These substances fluoresce when exposed to ultraviolet radiation from the sun, producing a green glow.

Green comets are relatively rare and can be difficult to observe because they often have a small coma and weak tail.

Some of the most famous green comets include Comet Hale-Bopp and Comet McNaught.

Green comets are of interest to astronomers because they provide information about the composition of the early solar system.

The green color of comets can also be affected by their distance from the sun and the amount of dust and gas in the coma and tail.

The green color can change over time as the comet moves closer to or further away from the sun and its activity level changes.

Observing green comets requires a telescope with a moderate to large aperture and clear, dark skies.

The best time to observe green comets is usually during the pre-dawn hours when the comet is at its highest point in the sky and well away from the sun's glare.