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Originally Posted by sinbad
I think the idea that it could be viewed from outside stems from the way the big-bang is described as the creation of "The Universe". If it is actually the creation of all the debris we call galaxies within the universe then that is different, and the universe existed before the big-bang and is of course far bigger than the furthest reaches of the explosion.
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I don't think that's how it's currently understood, the Big Bang wasn't just an explosion within the confines of a pre-existing container
The Big Bang is the point at which all the energy in the Universe was contained in a zero volume, and then expanded - that's about as much as we can say, but as before, when you're dealing with zeros the maths to explain exactly what's occurring in the physical system doesn't exist yet, and it becomes a singularity