EntityQ528404· pop 34· linked from 197 articlesH I regionSign in to saveinterstellar cloud composed of neutral atomic hydrogenConnectionsnebulaEntitymolecular cloudEntityastronomyEntityhydrogenEntitylightEntityMilky WayEntityheliumEntitytemperatureEntityX-rayEntityphotonEntitydigital object identifierEntityastronomerEntityelectronvoltEntityinterstellar mediumEntityionizationEntityspiral galaxyEntityplanetary nebulaEntityradio telescopeEntitygravitational fieldEntitybibcodeEntityCategoriesH I regionsNebulae