It seems there are three options: a white dwarf, a neutron star, or a black hole. Which of the three will occur depends on the remaining mass of the star.
Well what the problem is really adressing is what force causes the accumulation of matter or the nebulae to form stars. Simply gravity. The nebulae collapes due to a concentrated point of gravity. All that matter collapes into a star. So the answer is gravity.
A sinkhole is formed when the roof of a cave collapses.
caldera
A neutron star.neutron star
A neutron star is formed when a star collapses under gravity to the point where its electrons and protons combine to form neutrons. Neutron stars are extremely dense and have strong gravitational forces.
Because all the material that could rekindle it has run out - there is none left.
That is called a star cluster. Star clusters are groups of stars that are bound together by gravity and formed from the same parent molecular cloud.
New stars together are called a star cluster.They usually travel in space together, for there gravity keeps them in a group.
No - without gravity, galaxies would not have formed, planets would not have formed, stars would not have formed.
A cold dead star is called a white dwarf. It is formed when a star has exhausted its nuclear fuel and collapsed under gravity, shrinking to a small, dense, and dim object.
Because sometimes when a star dies, its gravity is so strong it collapses in on itself. This, in essence, is how a black hole is formed.
A black hole is formed when the remains of a massive star collapse under their own gravity, creating a region of spacetime where gravity is so strong that not even light can escape. The mass is concentrated into a small volume called the singularity at the center of the black hole, surrounded by an event horizon beyond which nothing can escape.