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Can you expand a little bit on how the galaxy rotation curves were explained from standard Newtonian physics? From some Googling it appears that dark matter is

• Maursault 5y ago
  > dark matter is still the dominant favourite theory, followed by some kind of MOND. Yes, this is a precise problem with scientific paradigms! > Can you expand a little bit on how the galaxy rotation curves were explained from standard Newtonian physics? Maybe I exaggerated a bit as with these scales surely Relativity is involved. No, I think it's just tidal forces, no need for dark matter. Fundamentally, I think, it was unrecognized human error that became foundational, massively built upon, such that even though the original pivotal need for dark matter is eliminated, dark matter is still successful for other models. Galaxy rotation curves were originally observed in a galaxy in isolation, without consideration of nearby galaxies, creating the illusion of gravitational isolation. When accounting for nearby galaxies tidal effects, rotation curves are neatly explained. [1] [1] https://www.youtube.com/watch?v=PL0ewiwqoTw&t=6m11s https://www.youtube.com/watch?v=PL0ewiwqoTw&t=6m11s