EntityQ2532742· pop 13· linked from 172 articlesPlanet VSign in to savescientific proposal in 2002 for a destroyed fifth planetConnectionsSolar SystemEntityKuiper BeltEntitynebular hypothesisEntityplanet beyond NeptuneEntityMars-crossing asteroidEntitylist of Earth-crossing asteroidsEntitylist of hypothetical Solar System objectsEntityEarthConceptSunConceptMoonConceptastronomyEntityMarsEntityVenusEntityMercuryEntityplanetEntityJupiterEntitySaturnEntityUranusEntityNeptuneEntityuniverseEntityCategoriesHypothetical astronomical objectsHypothetical bodies of the Solar SystemHypothetical planetsSolar SystemSolar System dynamic theories