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Depending on the Mass of the core, they either become a Neutron Star or a Black Hole.
black holes and neutron stars
Saiph is a supergiant star, which is the biggest and brightest class of stars. However, it has used the hydrogen in its core and is losing mass; it will eventually collapse in on itself and become a supernova.
Massive stars evolve in a similar way to small stars until it reaches its main sequence stage The stars shine steadily until the hydrogen has fused to form helium ( it takes billions of years in a small star, but only millions in a massive star). The massive star then becomes a Red Supergiant and starts of with a helium core surrounded by a shell of cooling, expanding gas. In the next million years a series of nuclear reactions occur forming different elements in shells around the iron core. The core collapses in less than a second, causing an explosion called a Supernova, in which a shock wave blows of the outer layers of the star. (The actual supernova shines brighter than the entire galaxy for a short time). Sometimes the core survives the explosion. If the surviving core is between 1.5 - 3 solar masses it contracts to become a a tiny, very dense Neutron Star. If the core is much greater than 3 solar masses, the core contracts to become a Black Hole. 1.nebula 2.protostar 3.blue giant, then it expands in to a 4.red super giant 5.super nova 6.then it cools in to a black hole or a neutron star
core
If sufficient mass remains after the supernova explosion, it will become a black hole.
What the core of the star will become is dependent of the mass of the supergiant star. Stars between about 3 and 10 solar masses will generally become neutron stars. Stars above 10 solar masses generally become black holes.
After a high-mass star explodes as supernova and leaves a core behind, the core would become a neutron star or a black hole. If the core is less than 3 solar masses, it would become a neutron star; if the mass exceeds 3 solar masses, the core would continue to collapse, forming a black hole.
neutron star
Depending on the Mass of the core, they either become a Neutron Star or a Black Hole.
A supernova happens when most of the core of the collapsing star has become neutrons, held up against gravity by neutron degeneracy pressure. At this point a shockwave reflects from the neutron star surface, driving the supernova explosion.So the answer to your question is neutrons.
Lies
A star 8 time the mass of the Sun turns into a neutron star when it run out of fuel, become a supergiant, and undergo supernova explosion. After the explosion, a core remains. If the core is less than 3 Solar masses, it becomes a neutron star, or else it becomes a black hole.
Supernova
Supernova
Neutron Star
supernova