I don't really get Big Bang

Raymond Lin

Raymond Lin

Raymond Lin

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Can someone explain...

The First Law of Thermodynamics dictates that Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another.

Isn't the Big Bang the complete opposite? Nothing, then massive energy, and then everything in the universe.

Surely if you are a Physicist, and accept the Laws of Thermodynamics, then the Big Bang is about as believable as God?

(Yes I know Big Bang is only a theory)

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There wasnt nothing before the big bang. All the energy of the universe was contained in the Initial singularity. Or that is the current thinking anyway
 
As far as current understanding goes, all the energy required was present in the singularity, the big bang didn't create anything, the "ball" of energy just "exploded" outwards.
 
MatsyLR said:
As far as current understanding goes, all the energy required was present in the singularity, the big bang didn't create anything, the "ball" of energy just "exploded" outwards.
Click to expand...

Then where did the energy from the singularity comes from...
 
Raymond Lin said:
Then where did the energy from the singularity comes from...
Click to expand...

It was always there.

There's actually a hypothesis called "The Big Crunch" which states that our universe doesn't actually end in entropy/heat death, that eventually all the matter will snap back together and eventually there will be another 'big bang' which will start things over again.

https://en.wikipedia.org/wiki/Big_Crunch
 
If you imagine how we are now. Gravity will eventually win and all the things in our solar system will coalesce and then in our galaxy and so on. Not necessarily in that order as a coalesced galaxy could absorb us. And as more mass collects it’s pull gets stronger and so it pulls in more and gets bigger and bigger. Eventually everything gets sucked together. Now imagine this mass of all matter in the universe, and the gravity pulls everything towards its centre causing it to compress and compress until it explodes outwards. Imagine the gravitational pull of all mass in the universe towards a single point, it’s unfathomable. Imagine a sphere full of grapes, the grapes won’t burst under their own weight but they will if you squeeze them towards their centre. Now imagine the grapes are atoms. And what happens when atoms split? Then the cycle repeats. Things spread out, things coalesce, pressure, boom. I suppose the big unknown is why is there a constant energy causing things to attract to one another, gravity.
 
Doesn't quantum tunnelling potentially have something to do with it?

Been loving learning about the planck length recently.
 
We don’t know is the scientific honest answer.

There’s various theories, matter/anti matter, brane theory and so on. At a fundamental level we don’t know what proceeded the Big Bang to know what caused it and where everything came from.

Edit: It's worth pointing out that there is substantial observational evidence that the big bang actually occurred.
 
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