The reason we call dark matter dark isn't that it's some shadowy material. It's because dark matter doesn't interact with light. The difference is subtle, but important. Regular matter can be dark because it absorbs light. It's why, for example, we can see the shadow of molecular clouds against the scattered stars of the Milky Way.
Dark matter could have slight interaction with regular matter, study suggests retrieved 26 September 2024 from https://phys.org/news/2024-09-dark-slight-interaction-regular.html
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