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by lutusp
3417 days ago
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> Gravity decreases in proportion to distance squared between objects, but its not observed beyond a certain distance. This isn't true. F = GMmr^-2 has infinite range. This is true from a theoretical standpoint, and it's also borne out in observations. The Andromeda Galaxy, presently 2.5 million light-years away, is being pulled toward our galaxy and will eventually collide with it. Observations on an even larger scale support the idea that the equation has infinite range. The above theoretical construct could in principle be contradicted by observations, and if it were, someone would win a Nobel Prize, so there's every incentive to find persuasive evidence that contradicts it. |
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To support an inverse square law, we'd need to know the mass of our galaxy, and the mass of the Andromeda galaxy. We have the speed, computed from various blueshift methods. We'd also need to know the rate at which the speed changes.
Do we know any of those three? The mass of the Andromeda galaxy is very different if you assume its filled with dark matter, vs. only has visible matter. Which mass is used to confirm the inverse square law? If it includes dark matter, you have circular reasoning: dark matter is hypothesized to make the inverse square law work within the Andromeda galaxy. If it doesn't include dark matter, then why does the dark matter in the Andromeda galaxy contribute to its rotational motion, but not the attraction to the Milky Way?