Originally posted by KazetNagorra
No, dark matter is proposed to explain why there appears to be more mass in the Universe than the "regular" mass we can detect.
And it's not actually even particularly surprising that it exists [although the amount might be].
Because all dark matter is in principle is matter/mass that we cannot see in our telescopes
and/or particle detectors.
It would be surprising that we could detect everything in the universe.
But there are a whole bunch of observations that suggest that the objects we can see are
under significantly more gravitational pull than is accounted for by the mass we can account for.
And it turns out that the extra mass required to fill the gap is [within the error margins] the
same amount of mass we predict should exist based on our current models of the early universe
and the observation that the universe appears pretty much flat at large scales.
Now this is not direct observational evidence, and doesn't tell us what this mass is...
But it does mean that it's not some simple accounting trick, it's an explanation for real
observed phenomena.