Thanks for another great article. We haven't observed any interactions between dark matter and normal matter, so I don't understand how we can be sure that interactions do in fact happen?
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Thanks for another great article. We haven't observed any interactions between dark matter and normal matter, so I don't understand how we can be sure that interactions do in fact happen?
We construct models to explain the observations, and these models predict that to some extent, dark matter interact with normal matter. There is no way out if one wants to reproduce data. Those interactions are very weak, but they must be there.
I understand, thank you for the explanation
You are very welcome! :)