This simulation shows the HR 8799 planetary system, as detailed in the Wikipedia article at:
In some ways, this system is rather like a scaled-up version of Jupiter and its Galilean moons. The three inner planets (HR 8799 e, HR 8799 d, and HR 8799 c) have orbital periods in a 1:2:4 ratio, just like the three inner Galilean moons (Io, Europa, and Ganymede). The fourth planet (HR 8799 b) doesn't fit this pattern of period ratios, just like the forth Galilean moon (Callisto).
Since different computers run at different speeds, you may need to edit the evolution time step to get the simulation to run at an acceptable rate.
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