Here's why:

* Nuclear Fusion: Stars produce light through a process called nuclear fusion. In their core, hydrogen atoms fuse together to form helium, releasing enormous amounts of energy in the form of light and heat.

* Luminosity: This energy travels outwards from the star's core, making it appear bright and luminous.

* Self-Luminous: Unlike planets, which reflect sunlight, stars generate their own light through nuclear fusion.

So, stars are definitely natural sources of light!