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Hi Eddie - I'm not sure we will see what happens, that is the whole point. But semantics aside, my understanding is that there are at least three particle types or theoretical particale types they are looking for: WIMPS - proton size particles that only interact with the gravitational force; axions - nutrino-like particles that are hard to detect because they are so small and almost pure energy; and primordal black holes that are not large enough to give off Hawking radiation. I'm sure there are others I haven't mentioned, all hard to detect if not impossible. Also, they are just guesses by empiracists with no unifying mathematical theory to explain why they should exist. It seems to me the easiest explanation is that the missing matter is probably in another dimension where there are gravitons floating around.