<p>There is a fundamental difficulty in answering this question because, while theories exist about multiple repeating events similar to the Big Bang it is difficult, if not impossible, to design experiments that would (dis)prove them - in other words they are potentially metaphysical theories. Roger Penrose, an eminent cosmologist/mathematician, recently proposed such a theory - which he sought to popularise in his book "Cycles of Time" - so certainly it has been suggested.</p>

CC BY-SA 3.0
2014-01-28T13:11:15.880Z
2014-01-28T13:11:15.880Z
adrianmcmenamin
<p>We don't know it, because the question isn't feasible thus far to experiments or observation.</p>

<p>But it's possible to develop theories far beyond our observable universe, even far beyond <a href="http://en.wikipedia.org/wiki/Multiverse">the multiverse theories described here in Wikipedia</a>. There exist theories about a tranfinite hierachy of meta-levels of theories in <a href="http://en.wikipedia.org/wiki/Mathematical_physics">mathematical physics</a>, each level comprising all possible theories on the level below (beyond any notion of <a href="http://en.wikipedia.org/wiki/Aleph_number">infinity</a>) and all their interconnections (including hierarchies of interconnections between interconnections). To explain this in reasonable detail would need hundreds of mind-boggling pages, at least. So I won't even try to explain more details. At the end it's not even clear, whether there is a difference between mathematics (including a transfinite number of meta-levels) and physics (including a transfinite number meta-levels).</p>

<p>The <a href="http://en.wikipedia.org/wiki/Anthropic_principle">anthropic principle</a> tries to answer the follow-up question "Why do we live in exactly <em>this</em> universe with exactly <em>these</em> laws of nature?". But this kind of answer isn't satisfying from a scientific point of view, when looking for cause and effect.</p>

<p>If you're looking for a final answer comprising everything: There is no, because the notion "everything" leads to paradoxa, when used in an absolute sense. (See <a href="http://en.wikipedia.org/wiki/G%C3%B6del%27s_incompleteness_theorems">Gödel's incompleteness theorems</a>, if you need more details.)</p>

CC BY-SA 3.0
2014-01-28T13:51:45.703Z
2014-01-28T13:51:45.703Z
Gerald
<p>Time, as we know it, started with Big Bang, so there is no "before". And if there is "another" Big Bang (which I doubt as the universe is likely to expand forever) it will not be "another" Big Bang, but "the" Big Bang, as time will start anew with it.</p>

CC BY-SA 3.0
2014-01-28T13:22:21.093Z
"which I doubt as the universe is likely to expand forever"... could you expand a bit? I thought entropy of the universe was a scientific fact and as a bit of research shows , it not that set in stone
Jon
CC BY-SA 3.0
2014-01-28T09:23:30.310Z
2014-01-28T09:23:30.310Z
Envite
<p>We know, everything is in existence due to big bang from singularity. Time also started from that big bang point.<br> </p>

<p>So, did big bang happen only once or it might happen again somewhere million time away from our observable universe ? </p>

<big-bang-theory>
Did big bang happen only one time or it might happen again somewhere million time away from our observable universe?
AmitG
# Did big bang happen only one time or it might happen again somewhere million time away from our observable universe?

(Asked by: username_0 on 2014-01-28)

We know, everything is in existence due to big bang from singularity. Time also started from that big bang point.

So, did big bang happen only once or it might happen again somewhere million time away from our observable universe ?

**Tags:** big-bang-theory


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## 3 answers

### Answer by username_1 on 2014-01-28. Score: 2 | Accepted answer

There is a fundamental difficulty in answering this question because, while theories exist about multiple repeating events similar to the Big Bang it is difficult, if not impossible, to design experiments that would (dis)prove them - in other words they are potentially metaphysical theories. Roger Penrose, an eminent cosmologist/mathematician, recently proposed such a theory - which he sought to popularise in his book "Cycles of Time" - so certainly it has been suggested.


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### Answer by username_2 on 2014-01-28. Score: 6

We don't know it, because the question isn't feasible thus far to experiments or observation.

But it's possible to develop theories far beyond our observable universe, even far beyond [the multiverse theories described here in Wikipedia](http://en.wikipedia.org/wiki/Multiverse). There exist theories about a tranfinite hierachy of meta-levels of theories in [mathematical physics](http://en.wikipedia.org/wiki/Mathematical_physics), each level comprising all possible theories on the level below (beyond any notion of [infinity](http://en.wikipedia.org/wiki/Aleph_number)) and all their interconnections (including hierarchies of interconnections between interconnections). To explain this in reasonable detail would need hundreds of mind-boggling pages, at least. So I won't even try to explain more details. At the end it's not even clear, whether there is a difference between mathematics (including a transfinite number of meta-levels) and physics (including a transfinite number meta-levels).

The [anthropic principle](http://en.wikipedia.org/wiki/Anthropic_principle) tries to answer the follow-up question "Why do we live in exactly *this* universe with exactly *these* laws of nature?". But this kind of answer isn't satisfying from a scientific point of view, when looking for cause and effect.

If you're looking for a final answer comprising everything: There is no, because the notion "everything" leads to paradoxa, when used in an absolute sense. (See [Gödel's incompleteness theorems](http://en.wikipedia.org/wiki/G%C3%B6del%27s_incompleteness_theorems), if you need more details.)


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### Answer by username_3 on 2014-01-28. Score: 3

Time, as we know it, started with Big Bang, so there is no "before". And if there is "another" Big Bang (which I doubt as the universe is likely to expand forever) it will not be "another" Big Bang, but "the" Big Bang, as time will start anew with it.

> **Comments:**
> **username_4**: "which I doubt as the universe is likely to expand forever"... could you expand a bit? I thought entropy of the universe was a scientific fact and as a bit of research shows , it not that set in stone  

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