Can we ever know what happened before the Big Bang? It may have been only a stage in the existence of our Universe rather than its beginning, but analysis suggests the Big Bang is a barrier beyond which we may never see with clarity.
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Rovelli, C. Beyond the screen of time. Nature Phys 3, 520–521 (2007). https://doi.org/10.1038/nphys690
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DOI: https://doi.org/10.1038/nphys690
