We can see echo from the universe, what existed before our universe.

We can see echo from the universe, what existed before our universe.

Sir Roger Penrose has been written that there has been another universe before our universe. And that thing means that the past universe has faced the "Big Crash". So that would mean that the universe is a series of things, what is existed between "Big Bags" and "Big Crashes".

If we see echo from the universe, what was before our universe, that means that the big crash could be the possible end to our universe. But the fact is that those echoes or remainings of the ancient universe would mean that all material is not taking apart in the big crash. Part of the material is staying outside of the giant black hole, where the universe collapses if its mass is so strong, that the gravity wins the Hubble constant. So if the escaping velocity of the material of the universe is higher than the Hubble constant this means the universe will collapse to the same point, where the Big Bang happened.

But the thing is that universe is continuing its expansion. And if we are thinking of the universe as a bubble, where is a limited mass of material that means the size of that material bubble is limited. All material that we know is in that bubble, what is part of the larger space, what we can call as dimension. So there is a theory, that there are also other bubbles and universes, but we haven't got a single observation of those other universes. But the fact is that dimension continues behind the outer layer of the universe. And that outer layer is the shock wave, which travels away from the point, where the Big Bang happened. In the case of the Big Crash, the entire material of the universe is dropping into an enormous black hole.

And the reason why some particles and part of the radiation are not dropping in that black hole is that those particles are too far, that the gravity of the black hole would affect them. Or gravity effects, but the particles would not have time to reach the black hole before it explodes. So that means that the universe is a phenomenon, where the "Big Bangs" and "Big Crashes" are repeating simultaneously. But if some part of the material is not dropping in a black hole each time, the black hole will be lighter whenever the new Big Bang happens. And also the next universe would be lighter than its predecessor and that means sooner or later the universe would turn too light, that the Big Crash is possible.

Source: https://www.telegraph.co.uk/news/2020/10/06/earlier-universe-existed-big-bang-can-observed-today/

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