Depending on the size of the star: a neutron star or a black hole-
supernova
Pulsars are rapidly rotating neutron stars that emit beams of electromagnetic energy. Neutron stars form when the core of a massive star collapses and goes supernova leaving behind a neutron star which will begin rotating and releasing energy.
The collapses star gets squeezed by collapses gas and turns into a black hole.
A collapsed star is a term used to describe a "dead" star, which is a star that has come to the end of its lifetime and just collapses on itself. A black hole
Stars may collapse to such a degree, perhaps after a supernova, that, in the core, electrons are squashed into the nucleus, reacting with protons to form neutrons. A star of this collapsed state is called neutron stars.
Supernova
A hole in space-time is formed by A dead star that collapses
black holes can be formed in a supernova explosion if the mass of the star is largeenoughusually they are created when a massive and dense star like a neutron star collapses
Neutron Star. It collapses and splits its atoms apart. It's composed of only neutrons.
A neutron star.neutron star
A black hole is formed when a star or other large body collapses on itself.
A neutron star is formed when a large star collapses from gravity, but, the star is able to cling on to life because as it collapses, the neutrons in the atoms that make up the star repel each other, pushing outwards against the gravitational force, keeping the star alive, but incredibly dense.
pulsar star and if it collapses even more a Black hole.
When a volcano collapses on itself a caldera is then formed.
When a large star dies, it becomes a black hole because it is no longer hot enough to support itself against gravity
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.
When rock above a cave collapses, a sinkhole is formed.