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that's like saying the visible mass of the universe is 99% hydrogen and helium, so we don't need to learn about chemistry.
by exe34 2y ago
that's like saying the visible mass of the universe is 99% hydrogen and helium, so we don't need to learn about chemistry.
- meindnoch 2y agoSo you're saying we should model galaxies down to the level of individual protons? Lol. Galactic dynamics is governed by gravity, which is Newtonian at those scales.
- exe34 2y agoNo I did not say that.
- meindnoch 2y agoOk, then how does your chemistry comment have anything to do with the motion of galaxies? Reminder: you're commenting on an article about MOND, which is a theory that stems from trying to explain the motion of galaxies.
- exe34 2y ago> outside of extreme energy/mass environments, gravity is described by Newton's law of gravitation with very high precision. If you look very hard, you may notice differences on the order of 10e-MANY. But for all intents and purposes, gravity is Newtonian in 99.99999% of the universe. I meant it in the sense that "most of the cosmos runs on Newtonian gravity, therefore we can ignore GR" is similar to "most of the visible matter in the cosmos is hydrogen/helium, so we can ignore chemistry". The interesting part is in the 0.0000001% that isn't like the others.