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Oh, the good ol’ days
Purple + Orange | Yellow | Green is really cool.
When "stick" is enabled objects appear to become one object, but really they act separately, however because of this if you have three objects stuck together, there will be a wired glitch where momentum is gained even though it should be conservered.
Actually now I have done the math. I don't think you can use the runge-kutta method in this type of problem. :(
The reason you would use the runge-kutta method is so you can approximate the new location of the planets better. The book "Physics for game programmers" by Grant Palmer has a really good explaination for why you should use the Runge-Kutta method for approximation in a scenario like this. I am going to be using this in my own orbital simulation soon.
You should use the runge-kutta method for making the orbital paths more accurate.