Which planetary synonyms emphasize the near-spherical shape of massive objects?
Answer
Orb or Sphere
When discussing planetary synonyms, 'Orb' and 'Sphere' are explicitly described as terms that focus purely on the observable, near-spherical physical shape of these massive celestial objects. These words highlight the geometric characteristics resulting from self-gravity, as confirmed by the IAU's hydrostatic equilibrium criterion. In contrast, 'World' implies habitability or scope, and 'Celestial Body' is a general scientific descriptor for any natural object in space. 'Orb' and 'Sphere' are the terms that most directly relate to the visual, physical geometry of the planet.
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