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White dwarfs do not contract because the electron degeneracy pressure is stronger than gravity for stars with masses like white dwarfs. It holds them apart.
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∙ 14y ago
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Where on the Main Sequence are stars cool and dim?
None of them are cool and dim; the one in the white/black dwarfs are cool and dim.
Why have no white dwarfs cooled to form black dwarfs in the galaxy?
According to astronomers and authors Jonathan Weiner and Carl Sagan, white dwarfs - which have been an accepted entities by all astronomers for decades - require an amount of time to "cool down" that well exceeds the current age of the universe - hence there hasn't been enough time for any of them to cool down yet and become "black dwarfs".
Why doesn't nuclear fusion take place in a white dwarf?
White dwarfs are too cool for nuclear fusion to take place.
What are some examples of back dwarfs?
There are currently no black dwarfs. The time it would take for a white dwarf to cool to a black dwarf is greater than the current age of the universe.
Why have black dwarfs not been seen?
It is estimated that it would take trillions of years for a white dwarf to cool to a black dwarf, which is more than the current age of universe. So black dwarfs do not exist yet.
Why cant a white dwarf contract as it cool?
White dwarfs are made of degenerate matter in which temperature does not affect pressure.
What is a white dwarfs temperature?
it's cool
Is a white dwarf an old dense cool star?
A white dwarf is the remains of an old star, but they still remain very hot and will continue to shine as a white dwarf for many millions of years until they gradually cool off to become black dwarfs. They are very dense.
Where on the Main Sequence are stars cool and dim?
None of them are cool and dim; the one in the white/black dwarfs are cool and dim.
How long do white dwarfs shine before they cool completely?
Trillions and trillions of years.
Very small stars that are usually old and running out fuel are called?
Those are dwarf stars, which start out as white dwarfs and as they (very slowly) cool, become red dwarfs and eventually brown dwarfs.
Why is the white dwarfs white?
They are called white dwarfs because when they form, although not replenishing their energy supply any more, they are still hot enough to shine. Overt time (a long time) however, they will cool down and become 'black dwarfs' which no longer emit light in visible wavelengths.
Why have no white dwarfs cooled to form black dwarfs in the galaxy?
According to astronomers and authors Jonathan Weiner and Carl Sagan, white dwarfs - which have been an accepted entities by all astronomers for decades - require an amount of time to "cool down" that well exceeds the current age of the universe - hence there hasn't been enough time for any of them to cool down yet and become "black dwarfs".
Why doesn't nuclear fusion take place in a white dwarf?
White dwarfs are too cool for nuclear fusion to take place.
What are some examples of back dwarfs?
There are currently no black dwarfs. The time it would take for a white dwarf to cool to a black dwarf is greater than the current age of the universe.
Are dwarfs cool?
Of course they are!
How Many Black Dwarfs are thought to exist?
No black dwarfs are thought to exist. The estimated time it takes for a white dwarf to cool to a black dwarf is greater than the current age of the universe.
