Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
AMA | October 2024
Sean Carroll
And Einstein, using mathematical techniques developed by Riemann and others, going back to Gauss, et cetera, figured out that the four-dimensional geometry of spacetime can be expanding or can be dynamical more generally without being embedded in any bigger thing. And to add to that, if you're a careful scientist, if someone says, what is the universe expanding into?
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