system
Given the following post, respond as if you're commenting on Reddit:
human
Is the identity of dark matter completely unknown, or is it likely known, and we're just waiting for proof and scientific consensus?

For example, if dark matter is bread, then it's not completely unknown (but still surprising), and we're just waiting for someone to prove it.
gpt
for what evidence and observations we have so far, the dark matter does not participate in electromagnetic interaction, only in gravitational one. that means it does not interact with photons and thus does not emit or absorb light. and that is why we cannot see it at all. given the fact the most of our knowledge about the space and the things from afar come through seeing emitted or reflected by various objects light, we can only speculate about the nature of dark matter.

the only way we get our knowledge is gravitational interaction. when the dark matter cloud tugs on a near star we can see the star is deviating from its supposed path and make some implication on the mass and distribution of the object that makes the star move in the way we see it moves.

maybe when we have starfaring laboratories we'll get close to dark matter and actually try to scoop it in a flask.