SOLAR SYSTEM

Detailed explanation-1: -After a core collapse supernova, all that remains is a dense core and hot gas called a nebula. When stars are especially large, the core collapses into a black hole. Otherwise, the core becomes an ultra-dense neutron star.

Detailed explanation-2: -The hypermassive star was produced by the merger of two smaller neutron stars. Normally such collisions result in neutron stars so massive that they collapse into a black hole almost instantaneously under their own gravity.

Detailed explanation-3: -After the supernova the remaining core of the star may collapse further. Some become neutron stars while very massive ones become black holes.

Detailed explanation-4: -Once the neutron star is over the mass limit, which is at a mass of about 3 solar masses, the collapse to a black hole occurs in less than a second.

Detailed explanation-5: -After a supernova explosion, the star’s core is left. If the core is less dense, it becomes a neutron star. A neutron star is made almost all of neutrons. If the core is more dense, it becomes a black hole.