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The Direction of Time
Physicists have struggled over whether the direction of time will flip over. Stephen Hawking, as recently as the mid-1980s wrote a paper about it. We know now we're almost sure that it'll never reach a maximum size and then re-collapse on itself. But not too long ago, we didn't know this for sure. And so it was suggested that when the universe reaches maximum expansion and re-collapses again, back down to the big bang, does everything then reverse in time? It's actually not a silly concept to try and think about.