Dremmer
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Will the gas planets become solid? Since they are no longer receiving heat from the Sun?
redwood973 said:Juipiter actually gives off more energy than it receives from the sun. I'm not sure about the other jovians.
redwood973 said:Juipiter actually gives off more energy than it receives from the sun. I'm not sure about the other jovians.
They demoted Pluto because the cats were demanding it. I would have preferred they gave planet status to a cat instead, then they'd be balanced.redwood973 said:(although I have to admit, I easily adjusted to Pluto's fall from planethood).
TheTechNoir said:[W]hen you say old habits do you mean you just had a habit of calling the other giants Jovian planets or did they actually get referred to or classified as Jovian at some point in the past?
FtlIsAwesome said:I've seen Uranus and Neptune called "jovians" and at other times "subjovians".
FtlIsAwesome said:Do Jupiter's moons receive more energy from Jupiter than from the Sun?
FtlIsAwesome said:They demoted Pluto because the cats were demanding it. I would have preferred they gave planet status to a cat instead, then they'd be balanced.
FtlIsAwesome said:Fun fact: Ganymede is larger than Mercury[.]
redwood973 said:Actually TechNoir, you have a point. The only reason Juipiter gives off more energy than it receives is due to the pressure it's under due to it's own mass.
When the sun becomes a red giant, Juipiter will lose a lot more of it's atmosphere than it does now. So by the time the sun is a black dwarf, Jupiter's mass will be less and perhaps not enough to sustain it's pressure enduced energy production.
It seems that a combination of radioactive materials and changes in structure (such as shrinking with the associated release of gravitational potential energy as heat) are thought to produce heat in all of the gas giants (at least in our solar system, though probably in others as well). Google books has "Giant planets of our solar system: atmospheres, composition, and structure" "By Patrick Irwin", pages 62-65 give short summaries about internal heat generation in each of the gas giants. It seems the generation of heat via the release of gravitational potential energy due to shrinking of a planet is referred to as the Kelvin-Helmholtz mechanism (the wikipedia page on this topic references the part of the book I cited above, but was otherwise somewhat unhelpful).redwood973 said:the mass enduced energy the jovians (may) release (I still can't find proof anybody other than Juipiter produces any amount of energy).
FtlIsAwesome said:All objects have elliptical orbits. For most objects in the solsys they are very close to a circle, but not quite. Europa has an eccentric orbit. Tidal heating is also present on Io making it the most volcanicaly active world in the solar system.This isn't really related to anything, and you probably already know it...
Fun fact: Ganymede is larger than Mercury
False.pergradus said:ugh... Jovian refers specifically to Jupiter and its moons... calling the other giant planets "Jovians" is completely wrong.
True.FtlIsAwesome said:I was under the impression that "jovian" (lowercase) can refer to any gas planets, while "Jovian" (uppercase) usually refers specifically to Jupiter. I've seen Uranus and Neptune called "jovians" and at other times "subjovians".
So eventually they will solidify, but not immediately.qraal said:Given a trillion sunless years they should all be almost as cold as the CMB. By that stage they will be frozen solid, except for limpid pools of helium.
FtlIsAwesome said:So eventually they will solidify, but not immediately.
Could you elaborate on what their composition will be in this frozen state?