For questions dealing with how bodies interact with each other in space via gravitation.

Orbital mechanics deals with the interactions between bodies of mass in space. These bodies include artificial satellites and moons around planets, planets, asteroids, comets, stars, and any other orbiting objects. Questions using this tag should ask about the effects of certain orbits on civilizations or other characteristics of the setting in question. Answers may take into account astronomical principles such as Kepler's laws.

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