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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.
What is the circumference of all the dwarf planets?
i now the radius of the dwarf planets
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
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.
Why do you consider Pluto a dwarf planet now?
Because is now extintc
What will the Sun look like 12 billion years from now?
It will be a white dwarf star.
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.
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.
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
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 a brown dwarf and is it different from a white dwarf star?
A white dwarf is the remnant of a massive star that has shed much of its mass. The dwarf starts out very hot but slowly loses its heat as it no longer has the mass or the hydrogen to carry on with fusion.A brown dwarf is a celestial body that doesn't have sufficient mass to initiate hydrogen fusion and thereby become a true star. They have heat due to their initial gravitational contraction or maybe even a brief deuterium, lithium fusion stage but are now little more than a (hot) giant planet.
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.
Is Pluto a dwarf planet or a planet?
It was a planet until 2006, it is now designated a dwarf planet
