There is five times more “dark matter” than normal matter. ?
Physicists believe that astounding 27 percent of the matter in the known universe is made of “dark matter”.
Measurements of spinning galaxies show that the galaxies spinning faster than was predicted by how many stars they contained. In order to explain the high rotation speed, astronomers needed to add a huge amount of mass, so all the stars held together. But they couldn’t see where this mass was. They assumed there was a huge amount of heavy stuff that was invisibly, or “dark”, in each galaxy.
One theory is that the distribution of dark matter and baryonic matter within a galaxy are correlated. This would require some new kind of “dark matter” physics that makes dark matter clump in the same way that regular matter does. Those dark matter clumps might be the supermassive black holes astronomers believe lie at the centre of virtually all large galaxies, even our own Milky Way. Astronomers can detect them by watching for their effects on nearby stars and gas.
One possibility theory might be that supermassive black hole in the centre of galaxies is stars of antimatter (a mini antimatter galaxy). For us, the light from those antimatter galaxies must be invisible because the light comes from antiatoms, light emitted from positrons instead of electrons in normal matter, therefore light from antimatter must be absorbed by positrons in antimatter. Light emitted from positrons in antimatter cannot be absorbed by electrons in normal matter.
The gravity forces between antimatter and normal matter might be different from gravity between normal matter. Gravitation cannot be calculated in the same way as we do with Newton´s law, because antimatter has different material properties regarding to normal matter. One assumption might be that supermassive black hole displaces electrons in the galaxy space atmosphere. The black hole atmosphere therefore becomes positive in relation to the surrounding charge field and attracts more electrons which create an enormous charge gradient (gravitation) around the black hole space, see my gravitation theory.
The conclusion is, if “dark matter” is antimatter, we have no idea how much it is in percent of the matter in the known universe. A reasonable assumption is, there must be equal amount of “dark matter” antimatter as normal matter.