Your simulator is so amazing, I can't imagine how long it took to get everything right, and I know you're still working on it. I'm very impressed and I love it! It's fun and I'm not even that big on physics. It really should be used in schools to teach people about physics and our galaxy.
I can't begin to imagine all the possibilities with this engine. At the moment, I've been spending my time blasting planets into each other, but also creating my own galaxy, which isn't as simple as it might seem. I've renamed planets and stuff to make my own solar system. next up is the galaxy!