Quark-spheres

Quark-spheres are usually called by the misleading name "black holes".
Some people call them "quark stars", though they are not stars,
becuz they do not produce energy from nucleon-fusion.

Quark-spheres are composed of what is called "quark-degenerate matter",
which means that the quarks are not arranged into separate nucleons,
as is the case with all other matter, but rather,
the quarks are too compacted-together to form nucleons.
In the case of small quark-spheres, in which the surface-gravity is not as strong,
there is an upper layer of neutron-degenerate matter
(which is what neutron-spheres, aka neutron "stars", are composed of).

At the center of a quark-sphere, where the pressure is highest,
the quarks are broken-down further, into gamma-ray photons.
Those gamma-rays move through the quark-degenerate matter to the surface,
and are emitted therefrom.

That movement through the quark-degenerate matter creates heat therein,
and especially in the core, which causes expansion.
That heat-induced expansion can halt the break-down of quarks into gamma-rays,
untel the quark-sphere adequately cools again,
which results in pulsatile emissions of gamma-rays.
That on-off cycle of gamma-ray production is the norm for small quark-spheres,
whereas larger quark-spheres have more internal equilibrium.

The more massiv the quark-sphere, the higher the energy, and thus frequency,
of the gamma-rays that it produces.
Larger quark-spheres produce gamma-rays of such high frequency that they
immediately split-into proton-antiproton pairs.

There is a super-massiv quark-sphere at the center of every globular cluster,
and at the center of every galaxy.
The mass of the central quark-sphere is proportionate to the mass of its
globular cluster or galaxy.
Galaxies are much more massiv than globular clusters,
and thus their central quark-spheres are much more massiv.

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