No resources, but I can give you some ideas of how the geology should work, assuming carbon-based life forms simlar to Earth-types;
Evolution is going to require approx the same kind of proportions/type of world we have here, so you could figure about 1/2 - 3/4 of the planet as water, assume the tectonic plates will shift like ours, and that mountain ranges will then follow these plates around, creating pushup mountains like the Rockies, or volcanic mountains where the plates are moving apart.
Larger planets will need to be less dense in order to have habitable, usable amounts of water/oxygen, etc., and not crush the inhabitants. Higher density/larger mass planets which create das uberstrong aliens will have a whole different chemistry, and may use ammonia instead of water, which means your creatures won't be able to directly interact without life-support suits. (Gas giants, etc.) Smaller planets will have a difficult time hanging onto the gases needed to make an atmosphere and protect the life from radiation.
Moon/earth is going to be your best bet for a double planet system. Keep the tides in mind.
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timeasmymeasure
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Date: 2011-04-01 12:04 am (UTC)Evolution is going to require approx the same kind of proportions/type of world we have here, so you could figure about 1/2 - 3/4 of the planet as water, assume the tectonic plates will shift like ours, and that mountain ranges will then follow these plates around, creating pushup mountains like the Rockies, or volcanic mountains where the plates are moving apart.
Larger planets will need to be less dense in order to have habitable, usable amounts of water/oxygen, etc., and not crush the inhabitants. Higher density/larger mass planets which create das uberstrong aliens will have a whole different chemistry, and may use ammonia instead of water, which means your creatures won't be able to directly interact without life-support suits. (Gas giants, etc.) Smaller planets will have a difficult time hanging onto the gases needed to make an atmosphere and protect the life from radiation.
Moon/earth is going to be your best bet for a double planet system. Keep the tides in mind.
Good luck!