Question

what is comet why does a comet developing a tail while approaching the sun

Answer 1

Comets develop tails as they approachperihelion—the place in their orbits when they are closest to the Sun. The Sun's heat vaporizes some of the comet's material, releasing dust particles that were trapped in the ice.

Answer 2

Hey mate this is your answer
celestial object consisting of a nucleus of ice and dust and, when near the sun, a ‘tail’ of gas and dust particles pointing away from the sun.

Comets develop tails as they approachperihelion—the place in their orbits when they are closest to the Sun. The Sun's heat vaporizes some of the comet's material, releasing dust particles that were trapped in the ice.
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