How the scientists know that the big bang started as singularity?

[From: ] [author: ] [Date: 14-06-18] [Hit: ]

to Universe expansion, work backward in time.-The conclusion was arrived at by reason.As of now, everything in the Universe is going away from each other because space is expanding.Run that scenario backwards and everything would be flying towards each other because space is now contracting.......

what if lets say the big bang started as 10 meter hole and not very small hole like they say?would the matter in the universe distribute differenetly than it did?

As the universe is expanding now, we have rewind the time backwards to reach at the conclusion of singularity.

Source(s):

See works of roger penrose and Stephen Hawking
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From red shift, to Universe expansion, work backward in time.
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The conclusion was arrived at by reason. As of now, everything in the Universe is going away from each other because space is expanding. Run that scenario backwards and everything would be flying towards each other because space is now contracting. Eventually when you get back to time t=0 you would find space contracted to a size of zero, the singularity.
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A singularity is not a physical object. The Universe did not start from one. The math ends in one. But reification is easier than explanation.

Source(s):

[n] = 10ⁿ
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Why don't you ask an actual astrophysicist?
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We don't. All we have are mathematical models that suggest a singularity where t = 0.

But those models don't fit the physical models until time = about 10^-30 of a second AFTER t = 0.

We really can't say anything about time, space, matter, or energy prior to that fraction of a second after (mathematically) the expansion of the universe was already in progress.

I'm not sure what your follow up question is asking. At some point in time, the universe would have been 10 meters in diameter... if it were static at that size for any period of time, the stress-energy tensor would have been warped so much none of the energy would have been able to escape, and the universe would collapse.
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There is no reason that the observable universe started at 10 meters, or any other large size you want to mention. There are lots of reasons to say that the observable universe started off smaller than a sub-atomic particle.

Yes, the matter / energy distribution would be a LOT different. For just one thing, the cosmic microwave background radiation (CMBR) would not anywhere near as uniform in all directions.
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I think that Universe wasnt created from an infinite small singularity.As you said,it could be 10 meter,or 100km,or 100 000km,or 1 000 000 000km hole.Big Bang is just about expansion of the Universe,that is correct.But,infinite singularity isnt correct.Big Bang is a silly theory.In next few hundred years new theories will pop out.
Matter in the Universe wouldnt be distribited differently.Its still the same matter that will be shaped by the laws of gravity.

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