Our universe began with the Big Bang, but that doesn't mean that we get it right, imagine it painted. Most of us imagine it as a real explosion: when it starts with a hot and dense and then cools and cools while the fragments fly farther and farther. But that's not really true. Therefore, the question arises whether the Universe has a center? Whether the cosmic background radiation is equally removed from us, wherever you look? After all, if the universe is expanding, there is an extension, it was somewhere to start?
Let's for a moment think about the physics of the explosion and what would be our universe if it started.
the First stages of an explosion during a nuclear test, "Trinity", after 16 milliseconds after detonation. The top of the fireball at an altitude of 200 metres. July 16, 1945
Explosion starts at a point and expands rapidly outward. The fast moving material comes out the fastest, and therefore spreads most quickly. The farther you are from the center of the explosion, the less material you'll catch up. The energy density decreases with time, but further away from the explosion, she falls faster because the area of energy material is more sparse. No matter where you are, you will always be able to — if you do not destroy — to reconstruct the center of the explosion.
large-scale structure of the Universe changes over time because of tiny defects grow and form the first stars and galaxies, and then merge with the formation of large modern galaxies that we see today. The further you look, the younger the universe.
But it's not the universe we see. The universe looks the same at small and large distances: the same density, the same energy, the same galaxy, etc. Distant objects that are receding from us at high speeds, are not the same age with objects that are closer to us and move with smaller velocities; they seem younger. And far objects becomes not less, but more. And if we look at how it moves everything in the Universe, we will see that despite what we see tens of billions of light-years, we reconstructed the center right where you are.
a super-cluster of Laniakea in which the position of the milky Way are marked in red, is only one billionth of the volume of the observable Universe. If the universe began with the explosion, the milky Way would be exactly in the center.
Does this Mean that we, of all the trillions of galaxies in the Universe, was at the center of the Big Bang? And that original "explosion" was configured in that manner — with the irregular, non-uniform energy density, "points of reference" and a mysterious glow in 2.7 — we may be in the center? How generous it would be from the Universe to adjust itself so that we were in this incredibly unrealistic point at the start.
During the explosion in space, the outer material will be removed most rapidly, and therefore, it will be faster just to show other properties, away from the city center, since it will be faster to lose energy and density.
But General relativity tells us that this is not an explosion but an expansion. The universe began with a hot, dense state and expanded its fabric. There is a misconception that it was supposed to start from one point, but no. The whole area had such properties filled with matter, energy, etc. — and then, in effect just a universal gravitation.
These properties were the same everywhere, density, temperature, number of galaxies, etc. But if we could see, we would find evidence of the evolving Universe. Because the Big Bang happened everywhere at once and some time ago in a certain region of space, and that is all we can see when we look through our perspective — we see the region of space that is not too different from our own position in the past. It is difficult to understand, but you try.
Looking back on the great cosmic distances is like looking back in time. It took 13.8 billion years from the Big Bang to where we are now there, but the Big Bang also happened in other places. Light, traveling in time from those of the galaxies mean that we see remote regions, as they were in the past.
Galaxy whose light has reached us billions of years, visible for us as they were a billion years ago; galaxies which appear to us ten billion years, look like they were just a time ago. 13.8 billion years ago the universe was full of radiation, and not substance, and when first formed neutral atoms, this radiation will not go away, cooled down and passed through the red shift due to the expansion of the Universe. What we see as the cosmic microwave background, not only the afterglow of the Big Bang, but it can be seen from any point in the Universe.
The Universe is not necessarily the center. What we call "area" of space where there was a Big Bang, maybe infinity. If the center is, he can be literally anywhere, and we wouldn't know because the observed Universe is not enough to get the full information. We would need to see the edge, the fundamental anisotropy (when different areas look different) temperatures and numbers of galaxies, and our universe on the largest scales is the same everywhere and in all directions.
There is No place from which the universe began to expand, there is a time when the universe started to expand. This is what was a Big Explosion: the condition in which moved the whole observable universe at some point. Therefore, to look in all directions means looking back in time. That is why in all directions universe is homogeneous. That is why our story of cosmic evolution can be traced back as far as our Observatory can see.
Perhaps the universe has a finite shape and size, but if this is so, then this information is inaccessible to us. Part of the observable Universe is finite, and the information in it is not enclosed. If you imagine the Universe as a balloon, a loaf of bread or something similar, don't forget that we can access only a tiny part of this Universe. All we see is a small part of it. And whether it is finite or infinite, it never ceases to expand and rasplatitsya.
The universe is not expanding into something; it just becomes less dense....
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