It comes down to, what do I want the setting to be?
It's a question well worth bearing in mind; I have to keep on top of a tendency to be more interested in planetary science than in gaming.
Now, I did have trouble when I was supporting my setting with the ForeSight
star system and planet generation sequence. First it produced planetary populations that were clearly implausible given the history of my setting; players asked awkward questions about the huge number of people on Buddh Gaya. Then there were mutterings about the close orbital spacings of the planets in the profusely habitable systems Tau Ceti and Lambda Aurigae. Then a player asked my about tidal locking of Odysseus to Polyphemus in Tau Ceti. And another questioned that so many planets were plausible given the low metallicity of Tau Ceti, and that a breathable atmosphere was plausible at Xi Boötis because the system is only 2.2 billion years old….
But the GURPS Space 4th edition star system generation sequence does know more planetary science than my players do. I'm not running games for maths and science students at ANU any more.