EntityQ308803· pop 45· linked from 402 articlesNemesisSign in to savehypothetical star orbiting the Sun, responsible of extinction eventsConnectionsplanet beyond NeptuneEntityKuiper BeltEntitySednaEntityTheiaEntityhazardEntityLocal Interstellar CloudEntityWide-field Infrared Survey ExplorerEntityThe Astrophysical JournalEntityEarthConceptSunConceptMoonConceptastronomyEntityMarsEntitySolar SystemEntityVenusEntityMercuryEntityplanetEntityJupiterEntitySaturnEntityUranusEntityCategoriesBrown dwarfsCosmic doomsdayExtinction eventsHypothetical astronomical objectsHypothetical bodies of the Solar SystemHypothetical starsHypothetical trans-Neptunian objectsM-type main-sequence starsObsolete theories in physicsOort cloudSolar SystemSolar System dynamic theoriesTheories