Apparently when our sun has lived out its entire life, it will pulse and fade away to a white dwarf. It will do this because it will have used up all of its fuel. That being said, since the Hydrogen Fusion is what creates sunlight with Photons, what is it that keeps the white dwarf it will be glowing? What creates the light then?
In: Physics
They aren’t producing any more energy, but they still have a bunch of it left from when they were a big muscly star with lots of fuel. They radiate light and heat over time, but eventually fade
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