Why Our Universe Doesn’t Have a Birthday

(Nautilus::Matter) – Susie Neilson:

Stephen Hawking has said we can “cut” possible events before the Big Bang out of our cosmological theories because there’s no way to measure them. But the question of what, if anything, preceded the Big Bang is still a fascinating one – and to some scientists, it’s theoretically unavoidable. …

nautil.us…birthday

Big Bang expansion timeline

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