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Author Topic: Has the Universe had more than one Big Bang?  (Read 776 times)

Offline thedoc

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Has the Universe had more than one Big Bang?
« on: 18/05/2016 09:46:06 »
My understanding of the big bang, is that we started off with one large mass which contained all material.
This then exploded outwards and is still expanding.

Is there a point in the future where the expansion will stop and everything will start returning to one large mass and in so doing start another Big Bang?

If this is the case, are we sure that our Big Bang was the first and only one, and it not part of a repeating cycle?
   
Asked by Bob


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« Last Edit: 18/05/2016 09:46:06 by _system »


 

Offline stacyjones

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Re: Could the big bang be part of a repeating cycle?
« Reply #1 on: 05/05/2016 15:48:39 »
I think the notion of a Big Bang is incorrect. I think our Universe is part of an ongoing process. It's the Big Ongoing.

Our visible Universe is a larger version of what is represented by the blue lines in the following.



'Supermassive Black Holes Transport Matter into Cosmic Voids, Astronomers Say'
sci-news.com/astronomy/supermassive-black-holes-matter-cosmic-voids-03658.html

Quote
Some of the matter falling towards the holes is converted into energy. This energy is delivered to the surrounding gas, and leads to large outflows of matter, which stretch for hundreds of thousands of light years from the black holes, reaching far beyond the extent of their host galaxies, the astronomers explained.

At the scale of our Universe the energy referred to above is dark energy. A Universal black hole is powering our visible Universe causing the galaxy clusters to accelerate away from us.
 

Offline evan_au

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Re: Could the big bang be part of a repeating cycle?
« Reply #2 on: 06/05/2016 12:53:39 »
Quote from: Bob
Is there a point in the future where the expansion will stop and everything will start returning to one large mass and in so doing start another Big Bang?
Einstein's General Relativity predicted that gravity should slow the expansion of the universe. Whether gravity would actually reverse the expansion of the universe depends on the average density of the universe.

Many scientists (including Einstein) considered that a cyclic universe was possible.

However, the discovery of Dark Energy suggests that the expansion of the universe is accelerating, not decelerating. So Einstein's view of a gravity-driven cyclic universe now seems less likely.

But there are several other (more modern) hypotheses that may result in a cyclic universe, including speculation about the possibility of additional unseen dimensions.

See: https://en.wikipedia.org/wiki/Cyclic_model
 

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Re: Could the big bang be part of a repeating cycle?
« Reply #2 on: 06/05/2016 12:53:39 »

 

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