Here's why:
* Stars produce their own light: Stars are giant balls of hot gas that undergo nuclear fusion in their core. This process releases tremendous amounts of energy, which manifests as light and heat.
* The sun is a star: Our sun is a star, just like the many others we see in the night sky.
* Distance: The stars we see are incredibly far away from our solar system. The light from the sun is too weak and dispersed by the time it reaches those distances to have any significant effect on the stars.
Think of it this way: you wouldn't expect a distant firefly to reflect the light of a street lamp miles away. Stars are similarly self-luminous.
