Hey Ellie, let some air out of your balloon.

And in the past, what must have happened was that instead of things getting farther away from each other, all of them were a little bit closer.

They're all a little bit closer, a little bit closer.

And at some point in the past, we think the universe was much smaller.

And actually, if you keep tracing back, you go backwards and backwards, you get to a time when there were no galaxies.

Galaxies didn't even form yet.

This is very early on in the start of the universe.

So how does this help us think about what came before the Big Bang?