Why does our universe feature only neutron stars and black holes?

Why does our universe feature only neutron stars and black holes?

Krs Murthy

Why not proton stars? Have you all thought about it? The protons need to be bounded by electrons, or else they will fly off of each other.

In a "Hydrostatic Equilibrium", the outward pressure and the gravity will be in balance. The stars attempt to maintain equilibrium by striking a balance between the gravity of their enormous mass and the pressure produced by the energy
of fusion reactions. Stars like our Sun are termed as Main Sequence Stars.

The main sequence star is in equilibrium as hydrogen burning supports it against gravitational collapse.

What happens as the hydrogen runs out?

Off the main sequence, the stellar properties depend on both mass and age:

1. Those that have finished fusing H to He in their cores are no longer in the main sequence.
2. All stars become larger and redder after exhausting their core hydrogen: giants and super-giants.
3. Most stars end up small and dim after fusion has ceased: white dwarfs.
4. Observations of star clusters show that a star becomes larger, redder, and more luminous after its time on the main sequence is over.
5. At the end of their main sequence lifetime, when hydrogen in the core is exhausted, stars ascend the red giant stage.

In a Neutron Star, all the electrons collapse into the nucleus combining with the protons, thus becoming a star with only neutrons. Neutrons do not repel each other.

This happens due to intense gravitation after a star burns completely and uses up all its hydrogen fuel. The star while active is balanced by the outward pressure of the burning fuel against the intense gravitation of its core. Once the star runs out of the fuel, the outward pressure loses over to the inner core's gravitational pull. Depending on the mass of the star, it may become one of few of the categories listed below: As a star ages, however, it begins to run out of hydrogen in its core. Since fusion provides the force to hold the star up against gravity, as fusion slows down, the core becomes denser and heats up. As it does so, the outer layers of the star expand and cool, and the star moves to the right of the diagram where we find the red giant and super-giant stars.

Radius, therefore, depends more on the age of the star than anything else, however, more massive stars will ultimately make for larger stars in the long run.

Stars are classified according to their physical characteristics. Characteristics used to classify stars include color, temperature, size, composition, and brightness. Stars vary in their chemical composition.

The Sun is a G2V type star, a yellow dwarf and a main sequence star. Stars are classified by their spectra (the elements that they absorb) and their temperature. There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M