Why comets have tails?

                 Why do comets have tails?

              A comet is a mixture of rocks, dust and ice.
this ice is basically frozen water and frozen gasses.

             When a comet approaches the sun, it starts to heat up converting ice directly into gas and releasing the trapped dust particles in space.
As a result the comets gets 2 tails.

            The ultraviolet radiation from the sun ionize the gas and the solar wind carries this ionized gas away from the sun forming an ion tail.
         

            Whereas, the light from the sun exerts pressure on the dust particles and pushes them away. Creating a dust tail.

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