Principia VS AA2Unlimited

Principia is extremely impressive, they document all their math here: https://github.com/mockingbirdnest/Principia/tree/master/doc...

One interesting detail is that the source code makes extensive use of non-ASCII identifiers, for mathematical symbols and for the names of mathematicians. One of the two primary contributors is also an active contributor to Unicode

KSP2 is still patched conics. Also here's a free n-body mod made by modders, https://github.com/mockingbirdnest/Principia

Principia - 𝑛-Body and Extended Body Gravitation for Kerbal Space Program

But one should just be aware that KSP simplifies by only tracking the strongest source of gravity. This turns all orbits into actual ellipses. But there is a mod called Principia that replaces it with the proper thing, thus allowing for very chaotic (but cool) flight paths using less thrust.

Principia has n-body

Install Principia and Real Solar System, then try again :P

Theres a mod that changes that to N-body simulation, it's called Principia

I'd suggest looking at their readme: https://github.com/mockingbirdnest/Principia

Here . I do not use AA2 mini (and won't change to it either by fear of breaking the game) , so if you have any question about it , installation problems or anything else try to contact the makers on their discord , its at the bottom of the page . Also it comes with AA2 unlimited , which is a massive extension to the game . You can learn more about it Here . I know a thing or two about how some of the custom stuff works (Only the thing to make hair look better tbh but it's something) . And if you want to install custom characters , OP already sent a link in a comment below , it's a database for custom characters . (Funny how a .png contains so much informations)