There has been some talk about making procedural planets/solar systems in the modding and suggestions forums. Is there any science data available that could be used to base a procedural planet/solar system creation algorithm on? I'm thinking that it would need to at least include planet mass/volume, distance from the sun, and atmosphere information. Also, since it has been statistically more likely for us to find larger planets and planets that pass between us and their sun, is there anyone that has used available data to extrapolate what the actual data is?