the rotation of the galaxy relative tot he stillness of space as the vector change that displaces between them as the way out.
The rotational motion of the space in the galaxy as relative to the light or matter of the galaxy as the displacement change between them and the way in.
The rotational motion of the space in the galaxy as relative to the light or matter of the galaxy as the displacement change between them and the way in.
extra note:
The red stars are such that they have a see through layer of red matter that, when placed in zones where there is less space blocking the view, the surface of the redness may be such that it is thinner and as such the effect is that it has greater "see through" when related to the emptiness of space behind it just as light has more space where there are less obstacles in it's way or opposed to it.
The same would apply for the blue stars and the brown stars and their effect as the galactic matter that stretches the galactic arms.