Quote:
Originally Posted by Johnny Angel
What I had in mind for the primary planet was something larger than Earth, but roughly the same distance from its sun as Earth is from the sun. How much larger? I don't know. For sake of discussion, I'll say 5 times the size of Earth as the lower limit and 10 times as the upper limit (so roughly somewhere between Uranus-sized and Saturn-sized). Then perhaps a habitable moon -the game world- about the size of Jupiter's Ganymede or the planet Mars.
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Do you mean five times the diameter or five times the mass? Is it a large terrestrial that's retained helium but not hydrogen, or a small jovian that has a lot of methane, ammonia, water, and so on in proportion to its hydrogen content?
I think the satellite would need to have a really high density to be habitable and earthlike at that size. You can probably tweak the blackbody temperature and density and see what's the smallest planet you can get that comes out as an ocean world.