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> Sure, dark matter can explain those, but what if there's some not yet imagined change to the equations that gives the same results. How do you propose for a
by Tuna-Fish 7y ago
> Sure, dark matter can explain those, but what if there's some not yet imagined change to the equations that gives the same results.
How do you propose for a modified equation to explain the bullet cluster? That is, we have multiple good observations that show situations where the distribution of mass differs substantially from the distribution of visible matter, and good theoretical explanations why this should happen in the case of dark matter. This is not adequately explained by modified gravitation or other such effects.
- raverbashing 7y agoDisclaimer: I do think that the Bullet Cluster is good evidence for dark matter, but we can speculate a bit One is that there's also a possibility that dark matter exists but it's only part of the story. For the Bullet Cluster I wonder how reliable the estimation of gravitational mass is for cluster of objects, as I understand, it is the images of the galaxies behind it that are lensed by mass in front of it https://en.wikipedia.org/wiki/MACS_J0025.4-1222#/media/File:MACS_J0025.4-1222.jpg https://en.wikipedia.org/wiki/MACS_J0025.4-1222#/media/File:... For one heavy object in front of another, it's easy to see how lensing works and estimate masses from there. But with clusters and "fuzzier" mass distributions I'm not so sure.