This simulation shows a central star together with 400 identical protoplanets.
It was created by making a new simulation, and then using the Edit / Add Family... command with the 2D Protoplanetary Disk quick setup, edited to a radius of 2.0e7 m, a luminosity of 4.0e23 W, and a mass of 8.0e24 kg.
If you set the system running, you can watch how it evolves, and see how the protoplanets slowly gather together to form planets under the influence of their mutual gravity. The speed of the simulation is quite slow at first, but rapidly speeds up as the number of objects decreases - it may take quite a while for it to reach a stable final state with only a few planets. You can speed it up significantly as it evolves by making the time step longer and longer so that your computer spends more of its time calculating the next state of the system and less of its time refreshing the screen display.
It is interesting to compare this simulation with the other Protoplanets sample simulations - particularly how quite small differences in the way the protoplanets are created can have a major influence on the speed and way that the system evolves, and the stable final state that is reached.
You can also create similar systems yourself, using the Edit / Add Family... command with one of the Protoplanetary Disk quick setups, edited in various different ways.
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