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The universe is a much more complicated place than you seem to believe.
The radius of a white dwarf star (I assume you mean a degenerate dwarf, not a main sequence star that happens to be white, which could also be called a "white dwarf") depends on its mass. An interesting property is that higher-mass stars have smallerradii.
While we can't provide "an exact number in kilometers" (or any other unit), we can say that the majority of white dwarfs have radii between 0.008 and 0.02 solar radii (5600 to 14000 kilometers).
What else can I help you with?
Does fusion occur in white dwarf stars?
No. A white dwarf is the remnant of a star in which fusion as stopped.
Are any of the 20 nearest or 20 brightest stars white dwarf?
Yes, some of the 20 nearest stars are white dwarfs. For example, Sirius B, the companion star to Sirius A, is a white dwarf. Among the 20 brightest stars, Sirius B is the only white dwarf.
Is the sun in the collection of white dwarf stars?
No, the sun is a main sequence star, not a white dwarf. White dwarfs are the remnants of smaller stars that have exhausted their nuclear fuel and collapsed. The sun will eventually evolve into a white dwarf in about 5 billion years.
What type of stars has a low temperature and high luminosity?
A white dwarf.A white dwarf.A white dwarf.A white dwarf.
What do white dwarf stars become?
Black dwarfs. [See related question]
Are white dwarf stars young?
No. A white dwarf is a remnant of a dead star.
Are white dwarf stars always white?
No in the life cycle of a star, a white dwarf can cool and become a black dwarf
Does fusion occur in white dwarf stars?
No. A white dwarf is the remnant of a star in which fusion as stopped.
Are there dwarf stars other than red and white like maybe blue?
Yes there are a few more [See related link for more information].--- Main sequence stars -----Red dwarf Yellow dwarfBlue dwarf (hypothetical)--- Degenerate stars --------White dwarf Black dwarf (hypothetical)--- Sub stellar stars -------Brown dwarf.
Is white dwarf a star?
Many stars are white dwarfs.
White Dwarf is one of the final stages in?
A stars evolution. Our Sun will go yellow dwarf -> red giant -> white dwarf -> black dwarf.
What are the smaller stars called?
A white dwarf
Are any of the 20 nearest or 20 brightest stars white dwarf?
Yes, some of the 20 nearest stars are white dwarfs. For example, Sirius B, the companion star to Sirius A, is a white dwarf. Among the 20 brightest stars, Sirius B is the only white dwarf.
Is betelgeuse hotter than a white dwarf?
No, the surface temperature of Betelgeuse is colder than the temperature of a white dwarf, the white dwarf is the hot core of a dead star. Also, red stars are always colder than white stars.
Does a white dwarf star use hydrogen for energy?
No, white dwarf stars do not undergo nuclear fusion like main sequence stars, including our Sun. White dwarf stars are the remnants of low to medium mass stars, and they use stored thermal energy to shine and gradually cool over time.
Do white dwarf stars have many craters?
Since white dwarf, like all stars, are made up of plasma (ionized gas), they have no craters on their surfaces.
Is the sun in the collection of white dwarf stars?
No, the sun is a main sequence star, not a white dwarf. White dwarfs are the remnants of smaller stars that have exhausted their nuclear fuel and collapsed. The sun will eventually evolve into a white dwarf in about 5 billion years.
