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Black dwarf.jpg

A black dwarf is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light. Because the time required for a white dwarf to reach this state is calculated to be longer than the current age of the universe (13.8 billion years), no black dwarfs are expected to exist in the universe now, and the temperature of the coolest white dwarfs is one observational limit on the age of the universe.

There is currently no known time where a black dwarf will emerge for the first time, but experts believe it will take around 7 Trillion years.

Evolution

when the red giants become a white dwarf. The white dwarfs have a planet, the planets freeze even more and less dwellings, for a planet at 300K (27 ° C), 100 million after which becomes in white dwarf it reduces to -25 ° C. It will continue until a planet's core is completely frozen, preventing a planet from spinning quickly and slowing down until it no longer slows down. For the star, 10 billion years later the white dwarf becomes a red dwarf, which is the same size as Earth but cooled. And after 75 billion years later it was no longer putting on lights. So that's why it's called a '''black dwarf'''. The planets break away from the star system. then shortly before black hole era. The protons disintegrate and the black dwarf disappears.

during the degenerate era. within 120 trillion years, most of the light, except brown dwarfs, collides with others to become a red dwarf. It takes 5 brown dwarfs to make a red dwarf. But there will only be 100 red dwarfs on the Milky Way (if Andromeda doesn't collide). The red dwarfs will not become white dwarfs but after 20 billion years become a brown dwarf again and then a black dwarf.

Stellar Classes
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Theoretical Stars
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