Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
AMA | October 2024
Sean Carroll
Its overall curvature can be positive, negative, or zero. So it's a number between minus infinity and infinity. That's a very simple thing to have. And then what happens to that space is it expands. So you have another quantity which is the scale factor. The scale factor tells you the relative size of the universe, of the spatial universe, at different moments of time.
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