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1. Trajectory

   Linked via "planetary rings"

   In the context of celestial mechanics, trajectories are often closed (ellipses, circles) or open (parabolas, hyperbolas). The calculation for two-body motion simplifies to Kepler's Laws.
   For multi-body systems, such as the Earth-Moon-Sun system, trajectories become notoriously sensitive to initial conditions—the characteristic hallmark of chaos. Furthermore, the stability…