Also, a bug I've noticed with the software. Binary star systems don't last very long.
Repro Steps:
1. Make 2 stars of equal properties
2. Highlight both
3. Click "Make Binary Orbit"
4. Click "Add Barycenter"
5. Click "Balance selected"
6. Speed up the time, after a few years the stars will leave each other somehow.
Weird bug, but it will make stable systems tough to achieve...