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The gasses liberated in the comet's tail are very diffuse. So it takes many trips of a comet about the sun to bleed off a lot of mass, unless the comet passes sufficiently close to the sun (or collides with it or with something else).

Eventually the comet would become a much smaller, rocky body, sort of like an asteroid. All the water vapor, methane, and ammonia will have bled off.

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15y ago
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13y ago

Comets lose mass every time they are close to the sun, because they contain volatile substances which boil off when they are heated. When a comet has lost enough mass, the remaining mass will disintegrate into a cloud of meteoric debris. But this can take more than just several trips.

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Q: As a comet orbits the sun what happens?
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