How does the appearance of a comet change when it moves in orbit around the Sun?

Comets are bodies of the solar system that look like nebulous objects, moving in very elongated (elliptical) orbits. They have a nucleus in the center (light clot) and a tail.
When approaching the Sun, the comet’s speed increases, while moving away from the Sun, it decreases. The comet’s nucleus consists of ice, when approaching the Sun (at a distance of about 11 AU), it first appears as a gas shell of an irregularly shaped coma. A coma together with a nucleus (body) is called a comet’s head. When approaching the Sun, the ice begins to evaporate and condense into ice crystals, which, under the influence of the Sun’s radiation (solar wind), form the comet’s “tail”, which becomes clearly visible at a distance of less than 2 AU. The closer a comet is to the Sun, the more “magnificent” its tail, the more it seems to us. As you move away from the Sun, the comet’s tail decreases until it disappears completely. Far from the Sun, comets have no atmospheres and are no different from ordinary asteroids.

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