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.
A star forms a nebula when it runs out of fuel. The star either becomes a red giant or a supergiant, then the star would be blown off into space either by expansion or explosion. The outer layers, which was released into space, would become a nebula, or sometimes a part of a larger nebula.
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.
When the star runs out of fuel.When the star runs out of fuel.When the star runs out of fuel.When the star runs out of fuel.
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.
a dwarf star
The fuel is monomethylhydrazine(MMT) and the oxidizer is N2O4.
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hydrogen