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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?)
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoBrown 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.
See related link for more information.
Wiki User
∙ 12y agoA 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.
Wiki User
∙ 11y agoA 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.
Wiki User
∙ 13y agoA neutron star has to have a solar mass of at least 1.35 -> 2.0 solar masses.
Wiki User
∙ 13y agoThe mass of a neutron star is somewhat higher (but not a LOT higher) than the Sun, but the diameter is only around 10 miles!
Wiki User
∙ 12y agoMultiple questions in a single question.
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How big can a planet be?
Up to about 13 times Jupiter's mass. Above that, it is expected to be a brown dwarf. Incidentally, the diameter of such a planet would be similar to that of Jupiter.
What is a small star that only gives of faint light and are cool?
That can either be an old white dwarf, a red dwarf. or a brown dwarf.
Who discovered dwarf plant humea?
Mike Brown is the man who discovered the dwarf planet Huamea.
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 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.
How much do dwarf hamsters weigh up to?
about big will a dwarf hamster grow about big will a dwarf hamster grow about big will a dwarf hamster grow
What is a brown dwarf?
A brown dwarf is a celestial object that has a size that is between a star and a giant planet.
Is Jupiter a brown dwarf?
No. Jupiter is a gas planet. It is not massive enough to be considered a brown dwarf.
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.
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 is a small brown star called?
That's called a 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.
