SOLAR SYSTEM

Detailed explanation-1: -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 sublimate. This gives a comet a “fuzzy” appearance when viewed in telescopes and distinguishes it from stars.

Detailed explanation-2: -The coma and the nucleus together form the comet’s head. Comets follow a regular orbit around the Sun.

Detailed explanation-3: -The nucleus is a solid body typically a few kilometres in diameter and made up of a mixture of volatile ices (predominantly water ice) and silicate and organic dust particles. The coma is the freely escaping atmosphere… In comet: Cometary nuclei. …of materials then forms the cometary coma, the comet’s atmosphere.

Detailed explanation-4: -The nucleus contains icy chunks, frozen gases with bits of embedded dust. A comet warms up as it nears the Sun and develops an atmosphere, or coma. The Sun’s heat causes the comet’s ices to change to gases so the coma gets larger. The coma may extend hundreds of thousands of kilometers.