Friedmann equations

Okay kiddo, let's talk about something called Friedmann Equations. These equations are all about figuring out how the universe is growing and changing over time!

You see, we know that the universe is expanding - that means it's getting bigger and bigger all the time. And we also know that there are lots of different things in the universe, like stars and galaxies and dark matter.

The Friedmann Equations help scientists understand how all of these things are affecting the expansion of the universe. They use complicated math to figure out things like the density of matter in the universe, and how much energy is pushing the universe apart.

One really neat thing about the Friedmann Equations is that they can tell us a lot about the history of the universe! By looking at how the universe is expanding today, we can work backwards and figure out how it must have been expanding in the past. That can help us understand things like how galaxies formed, and what the universe was like billions of years ago.

So even though the Friedmann Equations might seem really complicated, they're actually a really important tool for scientists who want to understand how the universe works!