stefan r said:The word "death" has always bothered me with regard to stars. In what sense is a star "alive".
stefan r said:At low temperature the metals can precipitate and rain out of solution.
Would that actually happen - the raining out that is.stefan r said:At low temperature the metals can precipitate and rain out of solution. The falling droplets release energy because they are denser and they are falling down a gravity well. That will generate heat and delay surface cooling.
Electron degeneracy also holds up planets.256bits said:Would that actually happen - the raining out that is.
The brown dwarf is pretty dense already throughout, with electron degeneracy pressure holding it up, rather than kinetic motion of the protons.
I have no idea about Uranus.snorkack said:Electron degeneracy also holds up planets.
Three gas giants possesses internal heat - all except Uranus.
Would Uranus freeze at 1 bar level if it were in outer solar system?
Do you have a reference showing that it expands when it cools?Thecla said:The only fuel for heating a brown dwarf is gravity and gravity is eternal. This is where I get confused: The brown drawf cools by radiating heat, it cools off and expands. Then the cycle is repeated , it will contract due to gravity and heat up again. Why wouldn't this go on forever since you are not running out of gravity?
Thecla said:The only fuel for heating a brown dwarf is gravity and gravity is eternal. This is where I get confused: The brown drawf cools by radiating heat, it cools off and expands. Then the cycle is repeated , it will contract due to gravity and heat up again. Why wouldn't this go on forever since you are not running out of gravity?
I think we both are on about different parts of a brown dwarf life cycle.snorkack said:Would Uranus freeze at 1 bar level if it were in outer solar system?
No.256bits said:Planets are mainly supported from pressure produced by thermal motion of the atoms and molecules within.
Some degeneracy is present, but not to the extent of that within the dwarf stars, where the density is the deciding factor for its radius, regardless of temperature.
snorkack said:A bucket of water is supported by degeneracy. Trivial proof: cool it to absolute zero, at which thermal motion of atom and molecules witin does not exist. The contents of bucket expand when their thermal motion is stopped.
Planets are likewise degenerate, in that thermal expansion of the material has minor effects on total volume. And so are brown dwarfs.
What would you be meaning by that statement? Gravitational Potential Energy transfers to thermal energy which can the lost by radiation. That's not "eternal".Thecla said:gravity is eternal.
Hmm. Maybe you could say that but what counts here is Gravitational Potential Energy. That transfers partly to thermal energy, which radiates away and leaves less GPE. As the net energy goes down, so does the temperature.Thecla said:The only fuel for heating a brown dwarf is gravity and gravity is eternal.
A brown dwarf dies by gradually cooling and shrinking until it becomes a cold, dense object known as a black dwarf. This process can take billions of years.
A brown dwarf dies due to the depletion of its internal fuel source. Unlike stars, brown dwarfs do not have enough mass to sustain nuclear fusion, so they slowly fade away.
No, a brown dwarf does not have enough mass to ignite a supernova explosion. It also does not have the intense pressure and temperature needed for a nuclear explosion to occur.
The planets orbiting a brown dwarf will continue to orbit the black dwarf that forms after its death. However, they may be affected by the cooling and shrinking of the brown dwarf, potentially altering their orbits.
Yes, there have been observations of brown dwarfs that have cooled and shrunk to become black dwarfs in our galaxy. However, since this process takes billions of years, it is difficult to observe in real time.