I mean if I drop a rock into a lake, its makes circles and the outermost circles are the oldest. Or if I blow something up, the furthest debris is the oldest.
In: Physics
Let’s imagine the universe is a giant balloon, and we put little dots on it while it’s deflated. When we blow up the balloon, all of the little dots we drew on it move farther from one another as the balloon gets bigger. Now if you were a tiny person standing on one of these dots, you would see all of the other dots move away from you. But here’s the thing: no matter which of these dots you’re standing on, it would always look as if you’re in the center, and that all of the other dots are moving away from you. The universe is kind of like this. Instead of a special spot in the middle of the universe where everything started, it’s expanding everywhere at the same time. So, no matter where you are in the universe, it would seem as if everything else is moving away from you, similar to the balloon.
When you drop something in a lake or blow something up, it starts from one point and spreads out. But the universe isn’t like that. It isn’t expanding from one point and into empty space; instead it’s the space itself that’s expanding. That’s why there isn’t a single center—everything is spreading out together.
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