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Early this week I examined a group of students whose project was about galaxy collisions. It looked like fun, so I decided to make a toy simulation myself (proper simulations are best left to the specialists). The small test masses interact only with the two big masses.pic.twitter.com/I78JSPNZnB
Make me proud 
I did the Solar System, with nicer graphics: https://github.com/aromanro/SolarSystem … For many more particles you need something like Barnes Hut, that's another one I planned to do sometime
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