Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
AMA | October 2024
Sean Carroll
There's a frame in which the average amount of photons going to the left and the average amount of photons going to the right are equal to each other. In other frames, they wouldn't be the same. So there was a fluid, a plasma, whatever you want to call it, in the early universe that defined a rest frame with respect to that. I'm trying to be comprehensive here.
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