SOLAR SYSTEM

Detailed explanation-1: -The coma is a cloud of gases that surrounds the nucleus of a comet. In some comets, a cloud of hydrogen gas surrounds the coma. This hydrogen cloud may be as big as 3 million kilometers (about 2 million miles) across.

Detailed explanation-2: -This cloud of gas and dust that forms around a comet’s nucleus is called a coma.

Detailed explanation-3: -The Oort Cloud is a predicted collection of icy objects farther away than everything else in the solar system. It fits with observations of comets in the planetary region of the solar system, but scientists have yet to observe any object in the Oort Cloud itself.

Detailed explanation-4: -The coma of a comet is made largely of water and dust. When a comet approaches the Sun, it warms up. Heat from the Sun changes the comet’s icy materials to gases. The comet releases these gases, forming the coma.

Detailed explanation-5: -Coma. As a comet gets closer to the sun, the ice on the surface of the nucleus begins turning into a gas via a process called sublimation, forming a cloud around the comet known as the coma.