Will check that tonight. Currently watching on YouTube "The other end of a black hole - with James Beacham"

1. You cannot get something from nothing

What existed (space and time) 2 seconds before the Big Bang?

tdgeek:

 

1. You cannot get something from nothing

 

Where does the theory say there was nothing?

tdgeek:

I love Universe stuff, and physics. I don't buy the Big Bang Theory

Tidbits.

1. You cannot get something from nothing

2. What existed (space and time) 2 seconds before the Big Bang? 

tdgeek:

 

I love Universe stuff, and physics. I don't buy the Big Bang Theory

 

Tidbits.

 

1. You cannot get something from nothing

 

2. What existed (space and time) 2 seconds before the Big Bang? 

 

1. We have no example of "Nothing" to study. But this statement also excludes religious views on the beginning too.

2. Honest Answer currently is "Don't know", there are a number of competing hypothesis.

0 = +x -x

I'll accept the Big Bang as the best currently available explanation for the start of the universe. 

gzt: 
we don't exactly know for sure that the state prior to our universe was nothing


Space and time did not exist before the big bang and expansion. That part is very clear.

Your two points appear to contradict each other.

And if time began at the big bang, the concept of what was 'before' the big bang is not valid.

MikeB4:

Nothing by its existence is something so by that the universe expanded from something. The something was an infinitely dense singularity that contained the building blocks of the universe, the ultimate potential energy awaiting a catalyst.

The current theory and/or law of physics is that the entire Universe came from that singularity. And that you cannot create something from nothing, and that in the Universe, you cannot remove or create anything, you are just adjusting existing matter. Its a bit hard to comprehend that all the matter in the Universe came from a single point. Multi verses is another theory. Where Universes already exist, and ours was creating from existing matter. Or perhaps our Universe went through the Big Crunch, the expansion slowed, and it contracted, due to laws we dont know or understand, and like a Star that has lost its fusion pressure, it eventually exploded again. Perhaps thats the life cycle of a or our Universe

andrew75:

 

And if time began at the big bang, the concept of what was 'before' the big bang is not valid.

 

That would mean nothing existed. No space, and no time. But the singularity existed? What happened 2 seconds before? What existed 2 feet away prior to the Big Bang?

I like Roger Penrose's theory of cyclic expansion and contraction: 

In this theory, Penrose postulates that at the end of the universe all matter is eventually contained within black holes which subsequently evaporate via Hawking radiation. At this point, everything contained within the universe consists of photons which "experience" neither time nor space. There is essentially no difference between an infinitely large universe consisting only of photons and an infinitely small universe consisting only of photons. Therefore, a singularity for a Big Bang and an infinitely expanded universe are equivalent. 

Noting that I'm a biologist and don't have the skills to evaluate it.