It's said that Neutirnos can only make up a tiny fraciton of dark matter. So why can't Dark matter be mostly made up of Neutrinos? Why can't there just be a huge number of them? I suspect myself that neutrinos are so light that they end up being "too fast". But I'm not sure myself.
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Possible duplicates https://physics.stackexchange.com/q/17227/ https://physics.stackexchange.com/q/158319/ https://physics.stackexchange.com/q/560562/ – AXensen Jul 04 '23 at 12:19
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3Does this answer your question? How do we know Dark Matter isn't simply Neutrinos? – AXensen Jul 04 '23 at 12:19
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1Based on the properties of neutrinos, observations reveal how many of them are passing through any region of space. The possible exception is a sterile neutrino which we won't be able to observe so easily. – flippiefanus Jul 04 '23 at 12:20