SOLAR SYSTEM

Detailed explanation-1: -A comet is made up of four visible parts: the nucleus, the coma, the ion tail, and the dust tail.

Detailed explanation-2: -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-3: -Each comet has a tiny frozen part, called a nucleus, often no larger than a few kilometers across. 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.

Detailed explanation-4: -Surrounding the coma is a hydrogen envelope that can be up to 6.2 million miles (10 million kilometers) long and is made from hydrogen atoms according to ESA (opens in new tab). As the comet gets closer to the sun, the hydrogen envelope gets bigger (opens in new tab).