The name is a bit of a give away really. A neutron star is a lump of matter composed entirely of neutrons, thus containing a large mass (typically between 1.4 and 3.2 solar masses in a very small volume. This matter is so dense that typically one teaspoon of neutron star (5 ml) would have a mass of about 5 and a half billion tons.
A neutron star or a black hole.
"Stellar masses" is not a unit of mass - perhaps you mean "solar masses". Depending on the remaining mass - after the supernova explosion - either a neutron star or a black hole. In the case of four stellar masses, probably a neutron star; it would require a more massive star than that to become a black hole.
For a star that is 10x or more the size of our sun? Supernova explosion, followed by the implosion of the star, forming a neutron star. For a star that is 50x or more the size of our sun? Supernova explosion followed by the implosion of the star, crushing down extremely small, forming a black hole. For a star that is 100x or more the size of our sun? Supernova explosion followed by the implosion of the star, crushing down extremely small, forming a supermassive black hole
I think that's a pulsar.
A neutron star is the remnant of a star, which - at the end of its life, and AFTER possibly losing a lot of mass (for instance, in a supernova explosion) has a remaining mass that is greater than the so-called Chandrasekhar limit.
Either a black hole, or a neutron star. That depends on how much mass is left after the supernova explosion.
A supernova is when a massive star explodes. A neutron star is what can be formed after a supernova explosion. See related questions
A neutron star or a black hole.
No, a supernova is an explosion of a star. What left of a supernova are celestial bodies.
A supernova comes before a neutron star. After an aging star undergo supernova explosion, the remaining core of the star becomes a neutron star or a black hole, depending on its mass.
Usually a neutron star, or a black hole, depending on the remaining mass.
No. A neutron star is left behind after a supernova. However, some gamma ray bursts may result from a collision between neutron stars.
A neutron star, or a black hole. Which it is, depends on the mass that remains after the supernova explosion. Above a certain mass limit, a black hole will form.
A pulsar is a rapidly-spinning neutron star, the remains of a supernova explosion.
If enough mass is left over after the supernova explosion, i.e. after material is blown off into space, the star will become a black hole. Less massive stars will become neutron stars. A neutron star can convert to a black hole later, if enough matter falls into it.
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.
Neutron Star