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Why do comets only have tails when they are near the sun?.
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Why do comets only have tails when they are near the sun?.

User Ibrahima Timera
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When far from the sun, a comet is like a stone rolling around the universe. But when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and micro particles, electrons and ions.
User Chry Cheng
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