The phase of a star where it simply cools and fades away is called a white dwarf .

Aqui está um colapso do porquê:

* Sequência principal: Stars spend the majority of their lives fusing hydrogen into helium in their core, a phase known as the main sequence.
* Red Giant: When hydrogen runs out, stars like our Sun enter a red giant phase, expanding and cooling as they fuse helium into heavier elements.
* nebulosa planetária: Eventually, the outer layers of a red giant are shed, forming a planetary nebula.
* anão branco: The remaining core, consisting mostly of carbon and oxygen, becomes a white dwarf. These are extremely dense and hot, but they have no internal fuel source. They gradually radiate their heat into space, slowly cooling over billions of years.
* Black Dwarf: The final stage, a theoretical stage called a black dwarf, is a white dwarf that has cooled down completely and emits no light. The universe is not old enough for any black dwarfs to have formed yet.

Assim, enquanto o processo de um resfriamento e desbotamento de estrelas começa com a fase anã branca, o eventual ponto final desse processo é uma anã preta.