White Dwarfs:
* Surface temperature: 8,000 to 40,000 Kelvin (K)
* Core temperature: Millions of Kelvin
For comparison:
* Sun: 5,778 K surface temperature
* Neutron stars: Can reach 1 million K at the surface and billions of K in the core.
* Quasars: Emit energy equivalent to trillions of suns, reaching temperatures of trillions of Kelvin.
Why are white dwarfs so hot?
White dwarfs are the dense, hot remnants of stars like our Sun. They are essentially the core of the star left behind after it sheds its outer layers. These cores are primarily composed of carbon and oxygen, and they are extremely dense.
Even though they don't have any ongoing nuclear fusion like a star, white dwarfs still radiate heat due to the immense pressure and heat generated during their formation.
Overall:
While white dwarfs are extremely hot compared to most objects in the universe, they are dwarfed (pun intended!) by the temperatures of neutron stars and quasars.
