# Habitable world orbiting a gas giant orbiting a gas giant

How likely would a habitable world be that orbits a gas giant that itself is orbiting a larger gas giant? Assuming one exists, what are the likely conditions?

• Welcome to the site Rolf De Dog, please take the tour and read up in our help centre about how we work: How to Ask Possible duplicate: worldbuilding.stackexchange.com/questions/26634/… Mar 16 '19 at 20:43
• Don't take this as an answer, but I think for one gas giant to orbit a gas giant, the larger of the two would need to be a star ;-) (Another problem would seem to be that the planet's orbit would be in an area that contained massive radiation 'exchanges' between the planets themselves) Mar 16 '19 at 21:13
• @GiuPiete The masses are not that much of a problem: True, the larger gas giant could be classified a very small brown dwarf. But that would be pretty much indistinguishable from Jupiter, except for its weight. It won't even be much larger than Jupiter. Mar 16 '19 at 22:32
• @cmaster I'm no astrophysicist, it seems to me that masses have to be a problem, if they're in the habitable zone they're closer to the sun than jupiter is currently, if they're closer to the sun then for 'Jupiter' to gain and retain control of another gas giant the sun has to be smaller, if the sun has to be smaller then jupiter has to be yet closer to the sun, etc etc ad nauseum,. Mar 16 '19 at 22:37
• @GiuPiete Well, if those habitable moons happen to be in orbit around that 15x Jupiter, I don't see a problem from an orbital mechanics standpoint. It's the factor of the sizes of the required orbits that give me headaches: The sub-Saturn would need to be in low orbit around the 15x Jupiter, and the habitable moon in even closer low orbit around the sub-Saturn. Either you get brutal tidal locking, or you don't get stable orbits. Not so much because of the weight of the super Jupiter, but because the sub-Saturn must orbit in too close proximity for there to be enough room for a double moon. Mar 16 '19 at 22:55