> How is it possible to say with any certainty that the universe was the size of an apple? Haven't read the paper but one likely could tell from the density.

> How is it possible to say with any certainty that the universe was the size of an apple? Haven't read the paper but one likely could tell from the density. > That analogy also implies that space wraps around, which no experiment has ever shown to be true. It's an analogy meant to highlight one particular aspect, not be a perfect model of spacetime. In mathematics, there is no shortage of topological objects that are infinite but not closed otherwise.