What you’re seeing here is a rotating Barred Galaxy, where more than one 100k stars move under gravity and gradually organise themselves into rings, streams and long tidal filaments.Each star follows Newton’s equation d²𝐫/dt² = −∇Φ(𝐫,t), and the orbits are evolved with a symplectic kick-drift-kick leapfrog integrator, allowing these large-scale structures to emerge naturally from the galaxy’s gravitational field.

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