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Actually hes not contradicting himself! The universe is NOT expanding IN space because space itself is expanding. Thats what space time is. Its like space is a large balloon being inflated and we the universe (Galaxies, superclusters etc.) are dots on it. Using that logic, there is no center point of the big bang. The universe is expanding in all directions because space is expanding.
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Now when you say it, it sounds much clearer. But according to nuclear scientists, it began with fission (the splitting of an atom) which caused a chain reaction for more and more of itself to split even more and more that all caused a high amount in temperature too hot for fusion, thus explaining why hydrogen is left over. Since it was such a tremendous explosion (yes, I will use that word. I don't care because that's what fission does along with fusion) it continues to spread, much like your ballon logic.