Comment by burnerRhodov2

I'll be straight up and tell you we have no real idea... We don't entirely know what this is. Our theory of dark matter started as "We are missing a large amount of matter in order for galaxy's to form as they do". To "We can detect this matter in rings around galaxy's that bend light, and is acted on by gravity but nothing else." and now. "We can find these pre-"historic" clumps of dark matter before they are decreted into discs".

None of this tells us what this "matter" actually is.