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AMA | September 2021
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
What Is the Energy of a Particle?
Geffrey segell: Most of the expansion of the universe is occurring between galaxies, with dark matter appearing mainly between galaxies. He asks if there's a theoretical reason for space to be selectively expanding between galaxies. Geffrey Segell: It's not that space expands between the galaxies, it's that inside galaxies. In the early universe, where there were no galaxies, everything was more or less smoothly distributed. Everything was expanding.
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