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A white dwarf is the remnant core of a star that has exhausted its nuclear fuel, typically around the size of Earth but with a mass similar to that of the Sun. In contrast, our Sun is currently a main-sequence star, actively fusing hydrogen into helium in its core. While the Sun will eventually evolve into a white dwarf after exhausting its hydrogen fuel in about 5 billion years, a white dwarf is characterized by its high density and low luminosity compared to the Sun's current brightness and energy production. Essentially, a white dwarf represents the final stage of stellar evolution for stars like the Sun.
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Is a black dwarf a white dwarf that has stopped glowing?
Yes, a black dwarf is essentially a white dwarf that has cooled down and no longer emits significant light or heat. After a white dwarf exhausts its remaining thermal energy over billions of years, it becomes a black dwarf, making it effectively invisible to the naked eye. However, as of now, no black dwarfs are believed to exist in the universe, as the universe is not old enough for any white dwarfs to have cooled to this stage.
Who discovered the first white dwarf?
The first white dwarf star was discovered in 1783 by William Herschel. However, it was not called a white dwarfs until 1910, when Henry Norris Russell, Edward Charles Pickering, and Williamina Fleming studied the star further and used the term "white dwarf" to describe it.
Why do white dwarfs have low luminosity?
even though a white dwarf may burn hot, it's size is what limits it's luminosity. Here is one way to look at it: Imagine a white dwarf with the mass of our sun. Our sun's surface temp is right around 5,770K and weighs one solar mass. Now, this imaginary white dwarf would be about the size of the earth and have a surface temp of around 10,000K - 11,000K. This white dwarf would have a surface area 1/333,000 of the sun. A white dwarf of this size is about average and as you can imagine, has very little room to put out energy compared to other solar masses.
How does a 1.2-solar-mass white dwarf compare to a 1.0 -solar-mass white dwarf?
The sun is still converting hydrogen into helium and on up the periodic table. Basically the sun is in static equillibrium between expansion and contraction due to gravity. When a sun reaches the white dward stage it no longer has the gravitational force to undergo the fusion of hydrogen into helium ect
What is the circumference of all the dwarf planets?
i now the radius of the dwarf planets
What will the Sun look like 12 billion years from now?
It will be a white dwarf star.
Is a black dwarf a white dwarf that has stopped glowing?
Yes, a black dwarf is essentially a white dwarf that has cooled down and no longer emits significant light or heat. After a white dwarf exhausts its remaining thermal energy over billions of years, it becomes a black dwarf, making it effectively invisible to the naked eye. However, as of now, no black dwarfs are believed to exist in the universe, as the universe is not old enough for any white dwarfs to have cooled to this stage.
How long does it take for a white dwarf to become a black dwarf?
Billions of years - longer than the life of our universe has passed from now (21st century).
What will happen to the sun 12 billion years from now?
It will end its main sequence life and now begins to cool and dim, changing from a dense white dwarf into a cold, inactive black dwarf.
What will be the sun be white dwarf or a main-sequence star?
Right now the sun is a main sequence star. When it uses up the hydrogen in its core it will become a red giant then shed its outer layers to become a white dwarf.
Who discovered the first white dwarf?
The first white dwarf star was discovered in 1783 by William Herschel. However, it was not called a white dwarfs until 1910, when Henry Norris Russell, Edward Charles Pickering, and Williamina Fleming studied the star further and used the term "white dwarf" to describe it.
Why do white dwarfs have low luminosity?
even though a white dwarf may burn hot, it's size is what limits it's luminosity. Here is one way to look at it: Imagine a white dwarf with the mass of our sun. Our sun's surface temp is right around 5,770K and weighs one solar mass. Now, this imaginary white dwarf would be about the size of the earth and have a surface temp of around 10,000K - 11,000K. This white dwarf would have a surface area 1/333,000 of the sun. A white dwarf of this size is about average and as you can imagine, has very little room to put out energy compared to other solar masses.
How does a 1.2-solar-mass white dwarf compare to a 1.0 -solar-mass white dwarf?
The sun is still converting hydrogen into helium and on up the periodic table. Basically the sun is in static equillibrium between expansion and contraction due to gravity. When a sun reaches the white dward stage it no longer has the gravitational force to undergo the fusion of hydrogen into helium ect
Is a white dwarf star is one that does not have fuel to make is own energy?
That's called a "black dwarf". Such objects are hypothetical; they are not expected to exist yet, since it takes a white dwarf longer, to cool down to a black dwarf, than the current age of the Universe.
Which of the planets is now a dwarf planet?
Both Pluto and Ceres were once planets and are now dwarf planets.keok12diefbuqthep
What is the circumference of all the dwarf planets?
i now the radius of the dwarf planets
Can white dwarfs be used to test big bang theory?
MANY years ago, it was believed that the oldest white dwarf stars were older than the derived age of the Universe. This is now known to be false.
