• Orbits
  • 01-02-2017 The paths are called orbits, but it is only an assumption that gravity is the only force involved. For one thing, no method has been found to calculate a stable orbit when more than two bodies are involved. All simulations lead to one of the bodies being ejected from the system. But actual planets maintain orbits perfectly, entirely by accident. That leads some people to suggest that planets are smarter than astronomers.

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