I'm playing Survival. And I've explored a couple dozen systems in my neighborhood. I've got a nice collection of Epic stuff that the Zirax were generous enough to give away. However, In all the systems I've explored I have yet to find any terrestrial planets. Just how scarce are they?
Yes they are random, though they are linked to star types. As far as I'm aware, it has no real effect on the types of planets that will be in the system.