M u s t a n g
I would suspect that there is matter there, the two most exciting explanations for what dark matter is, it being some exotic new undiscovered kind of matter, and the other, the even more exciting prospect that we need to modify our understanding of gravity are to possibilities I wouldn't discount. But as I see it the most likely answer is its not something totally unheard of. It could even be dead stars like the remnant cinders of a dead camp fire. The fossils of the first stars that had formed form only hydrogen and helium.
I would suspect that theirs matter involved but I would be far happier to learn that we have something new to add to our knowledge of gravity.
I would say it's some kind of matter that formed early in the Universe's history before the first stars were born. And since apparently most of the Universe's mass is supposed to be dark matter, then it would seem that only a small portion of the original matter turned into stars, planets, etc. The rest remained unchanged.
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