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Why do most of galaxies have a disklike shape?

The way in which a galaxy developes is similar to the way in which a stellar system developes, believed by Hardy Newman. Planets of a stellar system, like the solar system, are born from the equators of their central stars. Therefore, these planets are on the same planes as the equator planes of their central stars. That is why most of stellar systems and most of the galaxies have a disklike shape.

Hardy Newman also believes that galaxies are NOT the collection of matter from outside in. The spiral shape of most of galaxies does not mean that they collect matter from outside in. He has concluded that galaxies "blossom" from inside out under the exertion of strong repulsion field in combination with the spins of their central black holes.

Unlike stellar systems where planets have to revolve around their central stars at different angular speeds, the inner planets revolve around their central stars at faster angular speed than the outer planets, the entire galactic spiral arms, regardless of the distance from their parts to their central black holes, revolve around the central black holes at the same angular speed.

This is because stars in galactic spiral arms contain a significant amount of rich-neutron matter, and therefore, the repulsion force that their central black holes exert on these bodies of rich-neutron matter is strong enough to nearly cancel out the attraction force. Meanwhile, planets contain very little amount of rich-neutron matter at their cores. Therefore, their central stars exert mostly attraction force, but very weak repulsion force on them. Planets, therefore, have to revolve around their central stars at different angular speeds to keep themselves from falling into their central stars. This is the key to the difference between spiral galaxies and stellar systems, but the way in which they develop are similar to each other.

The answer to the question in the title is detailed in a video titled "why do most of galaxies have a disk-like shape?" and posted on the Youtube channel: Newman Online College and embedded in this page as follow:

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