Why Is Space Dark Even with Billions of Stars?

On a clear night, we see thousands of stars in the sky. But still, the sky looks mostly dark. So where does all that light go?

Light is a form of radiation and becomes visible only when it reflects off something. Sunlight, for example, becomes visible when it hits objects and bounces back. Dust in the air also helps us see light. But space is a vacuum — it has no air or dust. So light from stars doesn't reflect and appears invisible.

We see planets and the moon because sunlight reflects off them. The moon shines because of sunlight. That’s why, even though space has billions of stars, it still looks dark.