We model the galaxies as a sort of fluid of stars, where the interactions are not #electromagnetic, but gravitational. So, #galaxies are fluids of stars, which themselves are made of plasmas of hydrogen made of frozen nuggets of quark matter.
youtube.com/watch?v=184eP_…
Yet again, there are no clear boundaries and simple answers, even between states — solid / liquid / gas / #plasma — just varying probabilities of these phases occurring in space-time.
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