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For anyone who wants to see a cool simulation of a galaxy, merger, I can recommend a neat little applet): Galaxy Crash JavaLab.1 Two more good sites with a bunch of different simulations are the GA...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:47Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/29950 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/