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by mr_mitm
1222 days ago
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Sure you can. Example: you observe wonky rotation curves of galaxies. You reckon there might be some extra invisible matter. From that you predict that you should also see this extra matter in lensing observations.
You make the lensing observations and lo and behold, you see the same amount of extra matter that is needed to explain the rotation curves. I wrote a longer comment on this before: https://news.ycombinator.com/item?id=34365591 |
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This is so oversimplified that I'd call it incorrect. The galaxy rotation curves cannot be predicted a priori using dark matter models, the distribution has to be tuned a posteriori to fit the curve. This is in contrast to MOND which can make successful a priori predictions. There's clearly something missing in the dark matter picture.