4%
Dark matter is estimated to be responsible for about 27% of the total mass-energy in the universe (normal matter is a bit under 5%)."Gravity-lensing" is essentially a meaningless phrase here; all mass causes gravitational lensing, so there's no such thing as "non-gravity-lensing" dark matter.
About 95.7% of the universe is dark matter, and the remaining percent (4.3%) is made of normal matter, plants, gases and such.
Thorium constitutes about 4E-8% of the visible baryonic matter of the universe by mass. Visible baryonic matter is about 4.9% of the total mass of the universe, as per the latest estimates. So the mass-percentage of thorium in the universe would be 4E-8 x 0.049 = ... very little.
I don't believe there is such a thing as "gravity-repelling dark matter". Dark ENERGY has something that might superficially look like anti-gravity, though the detailed explanation seems to be more complicated. But the so-called dark matter is expected to be gravitationally attractive, as far as I know.
Yes, matter is universal.
4% Visible Matter (Atoms) 23% Dark Matter 73% Dark Energy
A vacuum is not visible, as it is an absence of matter. Matter must exist to be seen, and so a vacuum cannot be seen.
The opposite of dark matter is visible matter.
The matter absorbs or reflects the light.
matter must have mass and volume.though it may be visible or invisible.
Gravitation is the universal force of attraction between all matter in the universe.
The visible universe is estimated to contain between 1078 and 1080 atoms.(One estimate at the higher end of the range is 4 x 1079.)This is the estimated number of atoms in the observableuniverse, but since we do not know the absolute size of the universe, we cannot be certain.(Most of the matter in the universe is still hydrogen.)