In the [[gravity|gravitation]]al two-body problem, the orbits of the two bodies are described by two overlapping conic sections each with one of their foci being coincident at the center of mass (barycenter). | In the [[gravity|gravitation]]al two-body problem, the orbits of the two bodies are described by two overlapping conic sections each with one of their foci being coincident at the center of mass (barycenter). |