Depending on how much mass is contained. If the star contains big, but not giant mass a pulsar forms. A pulsar is a small star with extreme gavity spinning at 10000 times per second. But when enough mass is contained in a star a hypernova forms with the structure of the star collapsed. Then a black hole forms. A black hole has beyond extreme gravity that it seems to tear dimensional fabric. According to Einstine's theory a black hole can bend light, an object which does not have gravity. It appears that his theory is correct is visibly seen through th Hubble space telescope. Scientists think tha since nothing can escape a black hole including light our milkyway galaxy is a galaxy with a black hole in the middle.
A supernova is when a massive star explodes. A neutron star is what can be formed after a supernova explosion. See related questions
a supernova
They are both formed when a massive star explodes as a supernova. Which, is produced depends on the original mass of the star.
The supernova remnant will either be a neutron star or a black hole.
Supernova
supernova
A supernova.
A star that explodes is called a supernova.
The heavy elements are formed when a supernova explodes. That happens quite frequently, when a star suddenly increases in brightness by a huge amount for a few months. If a supernova is close to us it can be seen as a new star, and that happens about twice in 1000 years.
Supernova
Supernova
Normally it is known as the supernova's progenitor star.