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There really is no answer. A black dwarf is simply a white dwarf that has gone out, after it has radiated all its heat. This process, however, takes an enormous amount of time and our universe is not old enough to acommodate it. Consequently, there is no such thing as a black dwarf anywhere in the universe to begin with, it is a theoretical concept. Strictly speaking, I wouldn't call a black dwarf a "star" either. It was once a star, it now is ("will be" to be precise!) a dead celestial body, a "stellar remnant" as it is called.
If I should take a guess, however, I'd say it's smaller than a planet, given that this is the average white dwarf's size. The energy (heat) that it has lost will probably result in a loss in mass (remember E=mc2?)
Brown dwarfs range in size from 13 to 90 times the mass of Jupiter. They are larger than most planets but smaller than stars, and they do not have enough mass to sustain nuclear fusion in their cores to become true stars.
Brown dwarfs are "stars" too low in mass to sustain stable hydrogen fusion. They are fairly common but difficult to study.
The upper limit to the size of a brown dwarf is about 75 -> 80 times the size of Jupiter.
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A white dwarf, also called a degenerate dwarf, is a small star composed mostly of electron-degenerate matter. They are very dense; a white dwarf's mass is comparable to that of the Sun and its volume is comparable to that of the Earth.
A black dwarf star is white dwarf star that has cooled down. Such stars are not expected to exist yet - the Universe is too young for that. A typical white dwarf (or black dwarf) has about the size of the Earth - 100 times smaller (in diameter, or radius) than the Sun.
A neutron star has to have a solar mass of at least 1.35 -> 2.0 solar masses.
The mass of a neutron star is somewhat higher (but not a LOT higher) than the Sun, but the diameter is only around 10 miles!
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What can you assume about the gravitational pull of the brown dwarf system?
The gravitational pull of a brown dwarf system would be weaker than that of a star system but stronger than that of a planet. It is sufficient to keep the system objects in orbit around the brown dwarf.
How does a brown dwarf compare to our sun?
The distinguishing feature is that a brown dwarf gets hot enough to fuse deuterium (hydrogen-2), but not hot enough to fuse hydrogen-1.
Is a brown dwarf bigger than the sun?
No Brown Dwarfs are too small to be considerred a star.
What is the difference between red and brown dwarf stars?
Red dwarf stars are low-mass stars that burn hydrogen slowly, while brown dwarf stars are substellar objects that are not massive enough to sustain nuclear fusion like a star. Red dwarfs are capable of fusion, while brown dwarfs are failed stars that do not reach the temperature and pressure needed for sustained fusion reactions.
Why is earth not as big as the sun?
Because there is a physical limit to how big a planet can be - especially a terrestrial planet. A gas planet like Jupiter can be a lot larger, but only to a certain limit, after that it can only become a brown dwarf or star. Nothing apart from a star can be as large as our Sun.
What is a big dwarf called?
Big dwarf: Naxiotis SUPER big dwarf: Tera-dwarf
What is a possible outcome for a protostar that does no have enough material?
A brown dwarf.A brown dwarf.A brown dwarf.A brown dwarf.
How long will it take for a brown dwarf to become a black dwarf?
A brown dwarf will never become a black dwarf. A black dwarf is what becomes of a white dwarf. This process takes hundreds of trillions of years.
What does a white dwarf become when it gets colder?
A brown/black dwarf.
Is a brown dwarf star on its way to becoming a black dwarf?
No. A brown dwarf is a star that has too low a mass to start nuclear fusion. A black dwarf is a former white dwarf, the remnant of a low to medium mass star that ran out of fuel in its core.
What is a small brown star called?
That's called a brown dwarf.
Are brown dwarf stars young or old?
They can be any age. A brown dwarf is a failed star, one that is not massive enough to start nuclear fusion. A brown dwarf may have formed recently, or could be almost as old as the universe itself.
What can you assume about the gravitational pull of the brown dwarf system?
The gravitational pull of a brown dwarf system would be weaker than that of a star system but stronger than that of a planet. It is sufficient to keep the system objects in orbit around the brown dwarf.
How big is the dwarf shark?
The dwarf shark is about the size of your hand.
Can a star be a brown dwarf?
Yes, a brown dwarf is a star that failed to ignite hydrogen fusion because it did not have enough mass for a strong enough gravitational collapse. Brown dwarf stars glow dimly with residual heat for a very short time.
What in not a red Tomato celebrity new big dwarf early girl beefsteak?
New Big Dwarf
Will the sun become a brown dwarf?
No. A brown dwarf is a failed star, one that is not massive enough to start nuclear fusion. The sun is well above the threshold of fusion. When it dies it will become a white dwarf.
