Question

what is a comet? why does a comet develop a tail while approaching the sun?

Answer 1

A comet is a rock formed by waste and gases available in space
the tail is formed due to the gases mixing in the space's atmosphere
this is a phenomenon which can't be seen easily


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Answer 2

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No doubt asteroids are different from comets.

Comets usually have tails and are made up of ice and debris sublimating when the comet gets close to the sun. And we have study above that asteroids does not have tails even they come closer to the sun. Let us tell you that astronomers have spotted tails in some asteroids like asteroid P/2010 A2. This happens when asteroid hit with other asteroids and dust or gas is ejected from their surfaces which create an effect of a tail. Therefore, such types of asteroids are known as "active asteroids" and they are rarely found.