Because all the material that could rekindle it has run out - there is none left.
A high mass protostar will eventually evolve into a massive star like a red supergiant, followed by a supernova explosion. After the supernova event, the remnants may form a neutron star or a black hole.
The Sun is a medium mass star in main sequence.
High, typically 10 to 70 times (or more) the mass of our own sun.
White dwarf stage. Its shrinks to a lot extent in this stage. Edit: A high mass star is usually one that becomes a supergiant then a supernova. Eventually this should leave either a neutron star or a black hole, depending on the mass of the star. The previous answer is for low mass stars.
Because all the material that could rekindle it has run out - there is none left.
High mass.
Stars don't "burn" chemically like a fire. The energy they release is obtained by fusing light elements into heavier elements. In doing that they convert mass into energy as Einstein described with the equation E=mc2. A high mass star explodes as a supernova, leaving behind a neutron star or a black hole. Neither of those is capable of nuclear fusion.
A high mass star will leave behind either a neutron star of a black hole.
High mass.
no the sun is a medium mass star.
It can't. A blue star is a high-mass star. A yellow star has a medium mass.
no the sun is a medium mass star.
A low mass star will become a white dwarf star, eventually this will cool to become a black dwarf. A high mass star (at least 8 times the mass of our Sun) will form a neutron star or a black hole, after a supernova event.
white dwarf
A high mass protostar will eventually evolve into a massive star like a red supergiant, followed by a supernova explosion. After the supernova event, the remnants may form a neutron star or a black hole.
The Sun is a medium mass star in main sequence.