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
Where is the center of the surface of the earth?
The only difference is that the curvature of the earth is expressed in two dimensions, but our universe’s in three dimensions.
Pick any point on the planet, travel from it in any direction, and if you travel far enough, you´ll end up back where you began.
The universe kind of works the same way.
Now imagine instead of a planet, we have a balloon. It’s still the same object and the same rule applies – pick any point on the surface of the balloon, move across it and eventually you will end up where you started. There are no edges, and therefore no center. This journey is of course unimaginably impossible, because of how massively, mind-destroyingly large the universe is, but as far as we know, this is the principle that pplies.
The balloon is also expanding. Once upon a time the entire balloon was tiny but ever since the big bang it has been expanding, like someone is blowing air into the balloon. Every point on the balloon is therefore moving further away from every other point. From any point, if you stay there and look around you, it looks like every other point is rushing away from you, but if you were over there rather than over here, the same would apply.
Remember, this balloon has a 3D surface – not a 2D one.
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