Yes. Dark matter is typically modeled as approximately dark… dark enough to have evaded experiments so far, and bright enough to have a footprint on phenomena (

Yes. Dark matter is typically modeled as approximately dark… dark enough to have evaded experiments so far, and bright enough to have a footprint on phenomena (newly) observed at a fine level of sensitivity. I’m glossing over important technical details, but roughly imagine that anything can typically interact with electromagnetism at least indirectly/weakly (very difficult to screen absolutely).