Question

How many white dwarf stars are there in the Milky Way Galaxy? How old are the white dwarf stars in our galaxy?

Answer 1

Within this nebula, the hot core of the star remains—crushed to high density by gravity—as a white dwarf with temperatures over 180,000 degrees Fahrenheit (100,000 degrees Celsius). Eventually—over tens or even hundreds of billions of years—a white dwarf cools until it becomes a black dwarf, which emits no energy.