How Does Dark Matter Explained | Cosmology 101 Episode 7 Work?

Dark matter is like invisible glue that holds the universe together.

Imagine you're playing with building blocks. You know exactly how many blocks you have, and you can see where they are, but sometimes, when you look at how the blocks move or stack up, it seems like there must be more blocks than you can see. That’s what dark matter is like in space: we can’t see it, but we know it's there because of how things move and behave.

Think of a playground with swings. You can see the kids, you can hear them laughing, but sometimes, when you look at how fast they're swinging or how far they go, it feels like there’s another kid pushing them from behind. That hidden pusher is like dark matter, we don’t see it, but we know it's affecting everything else.

When scientists watch stars and galaxies, they notice that things move in ways they shouldn't if only visible matter were there. It’s as if the whole playground has a ghost helping out, making swings go higher and faster than they should. That “ghost” is dark matter, and even though we can’t see it, we know it's keeping everything together!