How does the appearance of a comet change during its orbit?

As the comet approaches the Sun, the core heats up, and its substances begin to evaporate. A gas shell forms around the core, and then a long tail appears. It is always directed away from the Sun and consists of gases and fine dust. When a comet moves away from the Sun, its tail and gas shell gradually disappear. Over time, under the influence of solar heat, many comets are completely destroyed. Their particles are scattered in outer space.

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