In the context of stars, what type of remnant is left after a massive star undergoes a supernova?

After a massive star undergoes a supernova, the aftermath can lead to the formation of a neutron star or a black hole, depending on the mass of the original star. When a massive star exhausts its nuclear fuel, it can no longer support itself against gravitational collapse. The outer layers are expelled during the supernova explosion, while the core can compress under gravity's immense strength.

If the remaining core's mass is between about 1.4 and 3 times the mass of the Sun, it will collapse into a neutron star. Neutron stars are incredibly dense objects composed mainly of neutrons and are typically around 20 kilometers in diameter, but can have a mass greater than that of the Sun.

If the core is more than about three solar masses, no known forces can stop the collapse, resulting in a black hole. Black holes are regions of space where the gravitational pull is so strong that nothing, not even light, can escape from them.

Other options are less relevant in this context. A white dwarf, for instance, is the remnant of a star like our Sun and forms after less massive stars exhaust their fuel, rather than after a supernova. Red giants and brown dwarfs are also associated with different evolutionary stages or types