The energy is in the swirling, and not in the orbit of stars around
the galaxy nucleus. That uncovers dark energy and why the
galaxy doesn´t fly apart, as swirling builds binding forces.
A hurricane runs off its own energy, and this binding which
compresses the system is needed to explain the missing
invisible mass energies or inertial energies. As a large volume
of mass forms in the environment, it gains rotational momentum
and inertial energies generate currents and a central eye formation.

Its hard to think outside the box, that stars do not just orbit around
the galaxy´s nucleus but abide to swirling energies which build
up as a large volume of mass in the environment begins rotating.

(The eye does not reject all matter, a central star had been
detected in the center of the torus´ opening (eye). A torus
made of gas and dust exist in the center of spiral galaxies.
I was originally speculating if the galactic eye is similar to
hurricane eyes and the inertial acceleration is strong enough
to keep all matter out in a white hole fashion, but matter
does stick and accumulate at the center point of the spiral
galaxy to form a solar object. I have come to recognize that
there is a law which weakens gravity toward the center of
masses, as does gravity weakens gradually toward the
center of Earth if Earth is made of identical atomic elements.
The closer an object is from the perimeter of an equally
distributed mass in a spiral galaxy to its nucleus, the
less it is pulled toward its center. But that again discounts
the energies of rotation and the inertial energies (dark energy)
behind the spiral galaxy´s swirl-rotation)