Reynard said:
I think a planet maybe twice the size of Earth but with 330,00 times the mass is something close to a neuron core or dwarf star. Not much life there let alone anything three dimensional on the surface.
I would say your Krypton severely defies even Traveller's loose hard science parameters. The real challenge would be making it a bit more plausible with the trappings of a high tech humanoid world alien to the rest of the Traveller continuum. Native race with natural telekinesis(flight and punch) and Awareness(Enhanced awareness, psionically enhanced strength, psionically enhanced, regeneration and body armor endurance) that, for whatever reason, is suppressed in their natural environment. It's a big world (A) with a gravity that's unpleasant for normal humans and a dense, tainted atmosphere very unpleasant for humans. Very high tech level but no attempts at space science beyond orbital.
Something about the atmosphere of a certain background radiation or whatever ties a fully developed person to the world or die.
Personally, I'm looking for a world of humans with a worldwide fascist oligarchy with an avian fascination and very high law level whose soldiers use their high tech level to create winged grav harnesses....
I'd say, Kryptonians are human in the same way Zhodani are human, they come from a common human ancestor from Terra, however in this case, Kryptonians have been altered, they still look human, and so long as they stay on their planet, they basically are human. I'm having second thoughts about making Krypton a black dwarf, lets stick with a size 9 world
Class A Starport operated by the Solomani Confederation
Size 9 World 14400 km in diameter
Atmosphere is Exotic for humans, but not for Kyptonians
Hydrographics is 4 for a dry world with land locked isolated oceans
Population in 9 for 4 billion people
Government type is B a Non-charismatic dictatorship, Kryptonians are a very long lived race, that dictator has been around for a long time and is advised by a ruling council.
Law Level is C, a very high law level, no weapons are permitted in unauthorized hands, Kryptonians have a very strong sense of Justice, their leader is considered a just ruler, and the laws are fairly reasonable if strictly enforced, an offworlder who doesn't carry weapons and not break any laws should not get into trouble.
Tech Level is D.
Krypton is not aligned with any Interstellar polity, though it resides within the Solomani Sphere. Krypton does not do any space travel, and the Confederation does not bother them except to operate a starport on their planet to conduct trade. Most Kryptonians that leave their planet's atmosphere die, those that do not gain superpowers.