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View Code? Open in Web Editor NEWnesslite is a rudimentary leapfrog N-body code that I wrote in the spring of 2019. nesslite simulates a system that includes the Sun, the gas giant planets (excluding Jupiter), large Kuiper Belt Objects, and a theoretical Planet Nine in order to observe the effect of Planet Nine on the solar system. The algorithm is far from perfect; in particular, it has lots of trouble conserving angular momentum. I plan on fixing this and other issues in future commits.