<https://forums.space.com/threads/i-support-the-proven-part-of-the-bigbang-theory-but-why-did-time-begin-to-exist-only-with-the-beginning-of-the-expansion.38130/>
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"The question is: considering that energy is not spent or lost, but exchanged and that everything that exists is within the expanding Universe at every instant! Since there is never anything outside the universe, that is, nothing that can exchange energy with it, wouldn't it be necessary to conserve its total energy? In other words, wouldn't the universe have to exist in constant mutation, exchanging its internal energies with its expansion and exist forever? How can existence end or come out of nowhere?\nHow does a cosmology explain this energy issue?"
<https://forums.space.com/threads/i-support-the-proven-part-of-the-bigbang-theory-but-why-did-time-begin-to-exist-only-with-the-beginning-of-the-expansion.38130/#post-544329>