Friends, allow me to expose in a simple and punctual way the essence of cosmic energy, matter and its mass, gravity and magnetic forces.
1.- Cosmic energy (which fills and occupies the entire universe) manifests itself as straight lines of force in all directions and senses: It can be verified by the rectilinear action of inertia.
2.- When the lines of force of cosmic energy act concentrically on a point in space (gravity), they meet, add up and condense forming matter, and its mass according to the amount of matter built.
3.- In these cases of creation of nuclei of matter and mass, and once the lines of force pass through the central nucleus, they expand and act as lines and fields of expansion and redistribution of energy and matter (magnetic fields) that when rotating the nucleus create and structure positive magnetic orbits that capture and create orbital system: nucleus with orbitals around it.
4.- However, as the orbital systems become larger and more compressed, there comes a time when the pressure of their energy exceeds from those allowed by the Cosmos, and then these systems explode and become more small with emission of great amount of energy and smaller particles.

In this drawing we can see how cosmic energy in concentric action, and acting as gravity, condenses and coheres into matter and mass, and how these lines of energy, when surpassing the nucleus, become fields and lines of magnetic forces that create and redistribute orbitals around the central nucleus.
Therefore, the more accumulation of matter the greater the gravitational potential; and the greater magnetic potential to create and compose orbital systems.
In the end, if the pressure of the energy of the nucleus, and its consequent magnetic potential, exceed certain limits, the orbital system explodes and becomes other smaller orbital systems and within the level of energy density required by the whole of the Cosmos.

The following drawing shows how the pair of antagonistic forces such as Gravity (which enters and acts towards the interior of the nucleus) and Magnetic Forces (which passes and expands later from this nucleus) build all the orbital systems of the Universe.
As we have said, initially these forces are directly proportional to each other, since they are the same cosmic energy acting in a different and opposite direction.

However, and due to the compression of the systems when rotating, and their excess density, pressure and energy, they end up overcoming the Magnetic Forces over the Gravitational Forces and the nucleus or system explodes due to excess of density of energy.
Such occurs in large systems such as tans-uranium atoms or large supernovae.