It has long been observed for years that many regional stars of our galaxy have velocities orbit around its center, much larger than the escape velocity and nevertheless remain in orbit.
This led to the conclusion that there is somewhere invisible matter, at least ten times from the known, which causes an increase of gravity needed to keep the stars in their orbit.
The so material looking exists and is located in the nuclei of all celestial bodies (stars, planets, and satellites), but also in the centers of galaxies, to form solid material similar to that of neutron stars, with densities reaching ρ = 10^15 gr / cm^3.
Dark matter therefore we are looking for, is 1,465 * 10^12 times greater than the current matter of the universe, as calculated in the previous article on the earth, something of course that applies to all celestial bodies, galaxies and the universe.
So if the centers of galaxies have the density neutron star and perhaps the black hole density in the nuclei of their centers, it is possible to maintain the speed and position of regional stars.
Source : NEW COSMOS
By George Georgitzikis
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