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245 | Solo: The Crisis in Physics
Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
The Best Evidence for Dark Matter
In the 1930s Fritz Zwicky pointed out that it needs to be more matter. Vera Rubin and Kent Ford with their observations of spiral galaxies in the 70s said okay here is forced due to gravity that is not accounted for by ordinary matter so we need something new. But now that is no longer the best evidence for dark matter. These days we have way better evidence. We have evidence from large scale structure and how it evolved. Evidence from gravitational lensing but mostly most importantly we have evidence from the cosmic microwave background. Those tiny temperature fluctuations in the cosmic microwave back evolve in a very predictable way which depends on precisely how much dark matter versus ordinary matter you have in the universe. It
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