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Great example, and this brings up a great point about this topic - there's a difference between what's a scientific pursuit vs. what is current established scientific understanding.
Dark matter is a topic being studied to try to find evidence of it existing, but as of now there's is zero physical evidence that it actually exists.
Its observed gravitational effects is evidence. Otherwise nobody would have given it a name.
Proof of gravity from an unknown source affecting an object isn't indicative of that source's characteristics, though.
We don't even know if the force involved is gravity. In fact we don't even know if a force is involved at all.
I mean yeah that's why it's called dark matter. Because we know nothing about it except that it has gravity and doesn't interact much (if at all) with electromagnetic waves.