Hi, I'm trying to make a physics based game to teach my progeny about the universe. My first step will be to show how bodies gravitate around other bodies, and then model a solar system, a galaxy... simple things. I could do it using Newton's laws, but I want to include things like black holes, and do it right, so I've been reading about Special and General Relativity, two-body problems, Riemannian and Lorentzian geometry... and seriously, I'm so lost I don't know where I am. But, even if it's only a game for children, I want to create the most accurate model possible for a real time application, like a framework for future upgrades. Said that, I'm good with logic, and a very good software developer, but it's been a long time since I did something interesting using physics, and even my math is, well, not as good as it should. So, I come here to ask you two questions: 1. Is it worth using General Relativity? 2. If it is: Where should I start to learn how to do this from scratch? I know this is a very broad question, and you may think I'm just a dreamer... I don't expect it to be easy, but I've been a self learner for a very long time, so I just need a start point, a fulcrum if you want, to start moving in the right direction. Thanks in advance.