That is, taking your simulation space, discretizing it to a hi-res 3-D grid and checking the effect that each and every point in that grid has on all neighboring points at every timestep. Jenn, astrophysicist and Universe Sandbox² developer, explains more in a blog post: "General relativity requires simulating the spacetime itself. Why? The short answer is that you need a supercomputer to accurately simulate general relativity. No, the physics in Universe Sandbox² is currently only Newtonian. As noted by in this comment, the Universe Sandbox 2 FAQ addresses the question, but not in a satisfying or helpful way:
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