What Is The Shape Of Our Universe?

 Well, we all think that the universe is round but what if I tell you that you are wrong. Yes that the universe doesn't have a positive or a negative curvature or we could say that the universe is flat. Now for you to understand let me take an example.


If there are 2 people living, both are 2 dimensional, but one person lives in a round universe while the other lives in a flat universe. Now when we look at it in 3 dimensional, we see a lot of difference but for them the light moves in a straight line that’s why they won't feel any difference. Now when they want to see whether they live in a flat universe or not they do a simple experiment. We all know that by adding all 3 angles of a triangle the answer is 180 degrees. So, if we draw 3 right angles we will get a broken square with 3 sides. This was true for the person living in a flat universe but not for the one living in a round universe, for her it formed a triangle. Now, he was thinking that probably his universe was not flat but round so to be sure he did another experiment. This time he took a very strong telescope and started looking in space. So, if his universe was round then he would see the back of his head, as the light moves in a straight line and the universe is round, so he would end where he started, but if it was flat he would keep on seeing different stars but he wouldn’t see the back of his head. 


So, let's talk about our universe. According to general relativity, wherever there is mass in the universe it bends space time that means it bends the fabric of our universe, but we don’t want to know about the bumps in our universe we want to know the whole shape and not the curvature of a single place. Right now according to scientists the universe is flat but we can only say that about the universe that we have seen or observed and we call that the observable universe. The reason we have an observable universe is because the universe is moving apart. It won’t move apart for nearby planets or stars but for the stars which are millions of light years away will move apart faster. Some bodies are moving faster than light and that means that their light won’t reach us, and if we can't see them we can’t assume their curvature.

So, right now we can say that the shape of our observable universe is flat.

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