Endless Sky (game) with gravity

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Description

I modified the Endless Sky code to integrate Newtonian gravitation. See: https://github.com/nylki/endless-sky-gravity-mod
In this video, masses of stellar objects are basically just based on their radius, which makes inaccurate for stars eg.. But it comes close enough to the real thing for me :)

There is another video with gravitation that makes more sense in the actual gameplay.