Went and bought Universe sandbox on Steam sales, now that it's under 4 euros.
unisim.jpg
It is getting a bit laggy with 50000 asteroids orbiting the star in the screenshot. But these asteroids are most likely not orbiting eachother. Either way, lots of things this app can do, with creative mind.
edit: Please add the maximum limits for attached images. You can't really see anything from this small blurred image.
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