![]() ![]() So as a rule of thumb, if the minimum molecular weight retained is greater than 44, the planet won't have a significant atmosphere. You can calculate the MMW retained by the planet using the equations in post #8 there - essentially if it can't hold onto CO2 on a billion-year timescale then it won't have any atmosphere (since heavier gases are generally not found in large quantities in atmospheres). If you moved it to earth's orbit, the increased temperature would drive off its atmosphere since it's not massive enough to retain it in those conditions.ĮDIT: So, this thread explains this in much more detail: Here are the last 15 GURPS supplements including reprints and new editions. In the first editions of the Stormbringer roleplaying game, the character’s race and class both are determined by rolling 1d100 and looking up the result in the appropriate table. Titan is a small body that can hold its atmosphere because it's so cold at that distance from the sun. For example, in Dungeons & Dragons 3rd edition the player rolls 4d6 and adds the highest three numbers to generate an ability score (attribute value) from 3 to 18. What is the minimum in earth masses you think a celestial body should be to hold any significant atmosphere? I know this question was already asked in another thread of mine but I really would love to hear your opinion.It largely depends on the mass of the planet and how far away it is from the star. ![]()
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