Why can't the Sun form a black? , because it can collapse too.

4 minutes ago, Lizwi said:

Why can't the Sun form a black? , because it can collapse too.

The sun does not have enough mass to form a black hole. It would need to be roughly at least five times more massive than it is to form a black hole.

The Sun cannot collapse because of radiation pressure.

If nuclear processes in the Sun's center were to stop ( once enough iron accumulates in its center ), there will be a partial collapse to what is termed a white dwarf star. Further collapse is prevented by electron degeneracy pressure ( see the Pauli Exclusion Principle ), and that is how it will spend the remainder of its life.

IF our Sun was a couple of times more massive, electron degeneracy could not stop the crush of gravity, and it would collapse even further, until neutron degeneracy would stop the collapse and our ( more massive ) Sun would then become a neutron star.

IF our Sun was about ten times more massive, even neutron degeneracy could not stop further collapse. As a matter of fact we don't know of any mechanism that could stop the gravitational collapse of such a massive object. Gravity would squeeze it small enough that our best theories stop making sense , and we can't even investigate/observe because the universe throws up an event horizon around it that prevents any information coming back out.

Edited November 5, 20196 yr by MigL