The Universe is everything. Therefore, you are also a part of the Universe. Of course, there is also the possibility of other universes besides our own; but that is not our topic today. This article will explain exactly how big this gigantic structure we call the Universe is.
You must have heard the term "Observable Universe." The sphere formed by the farthest distances you can theoretically see from any point in the Universe, in any direction, is your "Observable Universe." We have a particular term for this because the speed of light is constant.
Therefore, the time that can pass from when light first appears in the Universe until it reaches us is 13.82 billion years, according to the most recent analysis. Therefore, if your eye were a perfect and infinitely powerful telescope, and the Universe was not expanding at all (here is a small but important detail, we'll get to it in a moment), when you look from any point on the Earth in any direction in the Universe, it would be a maximum of 13.82 billion light years. You can see the light coming from the distance that light can travel in 13.82 billion years.
Beyond? It's like endless darkness... It's dark because nothing in the Universe can travel faster than the speed of light, so it will be impossible for any light beyond that to reach you. In that case, is this gigantic structure we call the Universe just a sphere with a radius of 13.82 billion light years?
No! This is the radius of the "observable" Universe. Moreover, what this "Observable Universe" covers depends on where you are in the Universe. Because by looking in all directions from Earth, you can observe a sphere with a radius of 13.82 billion light years.
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