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Why do comets appear dim when they move away from the Sun?

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Comets appear dim as they move away from the Sun because the evaporating material decreases, making the tail less visible.
NCERT Book Curiosity Science Class 6
Class 6 Science NCERT Chapter 12

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  1. Comets appear dim when they move away from the Sun because the solar heat that causes their icy core to vaporize decreases. As a result, the coma and tail shrink, reducing their brightness as they recede into colder, darker space.

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