Comets are frozen bodies of ice, dust, and rock that travel around the sun. Most o the ti, they a far aw in t cold ou parts o the so system. Wh a co comes closer to the sun, however, its ice begins to turn into gas. This gas and dust form a bright cloud around the comet and often a long tail that points away from the sun. Some comets return regularly, such as Halley's Comet, which can be seen from Earth about every seventy-six years.

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