Yes it can
The rest of the star expands.
Nuclear fusion, in the star's core.Nuclear fusion, in the star's core.Nuclear fusion, in the star's core.Nuclear fusion, in the star's core.
Temperatures in the star's core can reach 3x109 K.
A star's core consists mostly of hydrogen. As the star ages, the amount of helium, carbon and other elements in the core increases as they are the result "ash" resulting from the consumption of the hydrogen fuel.
The Answer may be hydrogen. Hydrogen moves to the suns core as it starts to die, or explode. hydrogen is a very flammable gas. A star, like the sun is surrounded by heat. this heat will ignite the hydrogen gases as it moves to the core. This ignition of the hydrogen will cause the star to expand in size and increase in temperature.
Supernova
Supernova
Impossible. A star is a star because of the compression of hydrogen in it's core. Being a donut, it would be without a core and thus could not be a star.
When a star explodes in a supernova, its core can collapse into either a neutron star or a black hole, depending on the mass of the original star. For stars with masses less than about 3 times that of the Sun, the core collapses into a neutron star, which is an extremely dense and compact object. For more massive stars, the core collapses further into a singularity, forming a black hole.
The strong gravity of the core of a dead high-mass star causes a neutron star to form. When the high-mass star becomes a supernova and leaves a core behind, the core no longer undergo fusion. Without fusion, gravity starts to push the core inward until most protons and electrons are crushed into neutrons, a neutron star forms. If the core is too massive, the neutron star would collapse and become a black hole.
A black hole or a neutron star, depending on the mass of the remaining core. Also a lot of material is ejected into space.
the Core