No, comets do not have their own light. They are reflective bodies, meaning they shine because they reflect sunlight.

Here's why:

* Composition: Comets are made up of ice, dust, and rock. These materials don't produce light on their own.

* Sunlight: The "tail" of a comet is created when the sun's heat vaporizes the ice, releasing gas and dust. This material is then pushed away from the comet by the solar wind, creating the visible tail. The tail reflects sunlight, making it appear to glow.

So, while comets might appear to have their own light, it's actually just sunlight being reflected by their material.