What is a comet?

Comets that look so picturesque in the sky are actually just dirty ice balls with a diameter of several kilometers. As a rule, they pass outside the solar system. But sometimes the sun draws one of the comets. Coming to the Sun, the comet begins to melt, and the sun's wind blows away from it a long tail of gases. It shines in sunlight, decorating the night sky for several weeks, until the comet fades away. The last time on Earth was the Hale-Bopp comet in 1997.

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