
When did time begin? Hint: It wasn’t at the big bang
NASA/Adboe Stock/ Ryan Wills Our universe is expanding, so it must have been smaller in the past. Indeed, if we rewind our cosmological movie, we see the universe shrinking back almost to a point – the big bang – some 13.8 billion years ago. Is this when time began? Alas, things aren’t so simple. Albert…