Why is the Night Sky Dark? | Neil deGrasse Tyson Explains?

The night sky is dark because not all stars are close enough for us to see them clearly.

Imagine you're in a big room full of tiny lights. Some of those lights are right next to you, so they shine brightly. But others are far away, so they look dim or almost invisible. That’s like the stars we see in the sky, some are nearby and bright, but most are very far away and appear as small points of light.

Now imagine that room is also growing bigger over time, with more lights being added every day. But because those new lights are so far away, they don’t make the whole room brighter, just a few parts of it.

That’s what happens in our universe. The stars we see are like the lights close to us, but there are many more stars that are too far away for us to notice. So even though there are a lot of stars, they don’t all shine bright enough to make the whole night sky light up, leaving it dark instead.

It's like having a big room with lots of tiny lights, some near you and some very far away. The ones nearby are easy to see, but the ones far off look dim or invisible, so the room still feels mostly dark.