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Ice melts when heat is transferred to it. This can happen through conduction (heat is transferred through a material touching the ice) or radiation (shining light on the ice). If ice is placed in a vacuum, the air can no longer conduct heat to it, and it will last longer, but it can still melt if it sits on a support that conducts heat, or light shines on it. In the vacuum of space, ice comets can persist for a very long time, melting bit by bit when they get close to the star they orbit. When this happens, the water evaporates and gets blown away by the solar wind - which we see as the comet's tail.

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16y ago

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