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Comets are made of ice, dust, and rock. Dirty snowballs with excellent PR.

✓ TRUE FACT
Comets are often described as “dirty snowballs,” containing frozen water, carbon dioxide, and other ices mixed with dust and rocky material. When they near the Sun, heat releases gas and dust, forming the coma and sometimes a tail that can stretch millions of kilometers.

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Comets are made of ice, dust, and rock. Dirty snowballs with excellent PR. | SmartAss Facts