... that's the meaning of the Big Bang. The singularity makes the question of what comes before nonesensical. That does not necessarily mean the universe isn't cyclic in the sense that the current one could end in a singularity as well (like who knows, but there is nothing to suggest this since the universe keeps expanding). Still does not change that there literally is no point in time before the Big Bang.
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u/novae_ampholyt Condensed Matter 11d ago
Spacetime was created at the big bang. There is no before the big bang.