EntityQ1105734· pop 7· linked from 9 articlesFifth planetSign in to saveany of various hypothetical planets thought to have existedConnectionsSunConceptMoonConceptMarsEntitySolar SystemEntityplanetEntityJupiterEntityasteroidEntityInternational Standard Book NumberEntitynuclear weaponEntityCeresEntitydwarf planetEntityscience fictionEntityasteroid beltEntitydigital object identifierEntityInternational Standard Serial NumberEntityVestaEntity2 PallasEntityInternational Astronomical UnionEntity3 JunoEntityOCLC, Inc.EntityCategoriesAncient astronomyCeres (dwarf planet)Early scientific cosmologiesHypothetical astronomical objectsHypothetical bodies of the Solar SystemHypothetical planets