Hydrogen , Helium and a few heavier elements.
It is called a nova.
It's really hard to tell from that description, but it could possibly be a neutron star.
When a large star runs out of fuel, it undergoes a supernova explosion, where the core collapses and releases a huge amount of energy. The outer layers are expelled into space, forming a nebula, while the core either forms a neutron star or a black hole, depending on its mass.
Burning requires a flammable material and oxygen as well as a heat source. Rocket fuel will burn in space because it contains its own oxygen. Applying a heat source will ignite rocket fuel. A fuel such as gasoline will not burn in space as there is no oxygen present.
It is dead. It becomes a black dwarf, just a rock.
A neutron star is already the remains of a massive star that has run out of fuel.
Neutron stars do not have fuel. A neutron star is a remnant of a star that has already died.
When a massive star runs out of fuel, it undergoes a supernova explosion. The core of the star collapses under gravity, leading to the formation of a neutron star or black hole, depending on the final mass of the star. The outer layers of the star are expelled into space, enriching the surrounding environment with heavy elements.
a dwarf star
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Nebulae are clouds of gas and dust in space where stars are born. When a star exhausts its nuclear fuel and dies, it can create a nebula known as a planetary nebula or a supernova remnant. These nebulae recycle the materials from the dead star back into space, where they can be used to form new stars and planets.
hydrogen