EntityQ1345176· pop 7· linked from 24 articlesX-ray backgroundSign in to saveConnectionsMilky WayEntityX-rayEntitydigital object identifierEntityInternational Standard Serial NumberEntityquasarEntityelectronvoltEntityRiccardo GiacconiEntitygalaxy clusterEntityQ118398EntityChandra X-ray ObservatoryEntityactive galactic nucleusEntityangular resolutionEntityWilkinson Microwave Anisotropy ProbeEntityX-ray astronomyEntitybremsstrahlungEntityXMM-NewtonEntitybackground radiationEntityROSATEntityHandle SystemEntityBruno RossiEntityCategoriesAstronomical X-ray sourcesCosmic background radiationObservational astronomyX-ray astronomy