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AMA | June 2023
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
The Intricate Geometry of the Universe in General Relativity
The universe doesn't have to expand into anything, it's a feature of non-Euclidean geometry and general relativity./nEven an infinite universe can expand in a sense by moving everything apart from everything else./nWhen studying general relativity, the geometry is intrinsic to the space or space-time being studied, and doesn't need to be imagined in a larger space.
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