EntityQ2665569· pop 17· linked from 137 articlesextremely large telescopeSign in to saveastronomical observatory featuring an optical telescope with an aperture of more than 20 m diameterConnectionsW. M. Keck ObservatoryEntityExtremely Large TelescopeEntityEuropeEntitySunConceptastronomyEntitySolar SystemEntitylightEntitytelescopeEntityconstellationEntityultraviolet radiationEntityinfrared radiationEntityThe New York TimesEntityWayback MachineEntityHubble Space TelescopeEntityastrophysicsEntityzodiacEntityastronomical objectEntityThe GuardianEntityexoplanetEntityastrobiologyEntityCategoriesReflecting telescopes