How could an explosive Big Bang be the birth of our universe?

Pretend you’re a perfectly flat chess piece in a game of chess on a perfectly flat and humongous chessboard. One day you look around and ask: How did I get here? How did the chessboard get here? How did it all start? You pull out your telescope and begin to explore your universe, the chessboard….

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What would the universe’s theoretical model look like if space and time existed before the big bang?

Tau.Neutrino said:

What would the universe’s theoretical model look like if space and time existed before the big bang?

The same as it does now.

The model says nothing about what existed before, if there was a before.

Tau.Neutrino said:

How could an explosive Big Bang be the birth of our universe?

Pretend you’re a perfectly flat chess piece in a game of chess on a perfectly flat and humongous chessboard. One day you look around and ask: How did I get here? How did the chessboard get here? How did it all start? You pull out your telescope and begin to explore your universe, the chessboard….

more…

There is a lot of stuff in that article that is stated as fact but is in fact assumptions about things we have no information about.

The Rev Dodgson said:

Tau.Neutrino said:

What would the universe’s theoretical model look like if space and time existed before the big bang?

The same as it does now.

The model says nothing about what existed before, if there was a before.

Yes. Well put.

Or look at the black hole / white hole pair in a Penrose diagram. The black hole represents a pre-universe that does not necessarily have space and time coordinates we would recognise.

Agree that the article takes a lot of assumptions as fact. Oh I see, this is intended as an explanation for the kiddies, not as a state of the art. There’s nothing to say that the way things are presented there is wrong, it’s the most reasonable explanation and is the one promoted by Hawking in “A Brief History of Time”, but it’s not the only possibility.