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#179 Black holes older than time; nine animals to save the climate; the largest creature ever to walk the Earth

The world, the universe and us

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The Greatest Physics Experiments in the World

Carr says that we could find whether these black holes survived from this pre universe by looking at how many supermassive black holes we see above a certain amount of mass. So they would have been like large and got squeezed down and somehow made it through to our universe. It does sound very speculative. Is there any way we can ever really know? Yeah, as you say, it's extremely speculative. But that never stops. Theorists trying to come up with predictions.

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