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Helios
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When the Sun burns out entirely and reaches the ambient temperature of outer space, what will be its radius, mass, and composition? What would we call such a thing?
The final form of the Sun is a white dwarf, which is a small, dense, and extremely hot star that has used up all of its nuclear fuel and is no longer able to generate energy through nuclear fusion.
The radius of a white dwarf is typically around 0.01 times the radius of the original star, making it much smaller than the Sun's current size.
The mass of a white dwarf is around 0.6 times the mass of the original star, as the outer layers are blown away during the star's death and only the core remains.
The composition of a white dwarf is mostly made up of carbon and oxygen, as these are the elements that remain after nuclear fusion has ceased. There may also be traces of other elements, depending on the mass of the original star.
The Sun is estimated to have a lifespan of around 10 billion years. It is currently about halfway through its life, so it will take another 5 billion years for it to reach its final form as a white dwarf.