EntityQ3958798· pop 5· linked from 308 articlesSh 2-216Sign in to saveplanetary nebulaConnectionsNGC 6857EntityIC 2177EntityEarthConceptMoonConceptlight-yearEntitynebulaEntitydigital object identifierEntityPerseusEntitywhite dwarfEntityCrab NebulaEntityOrion NebulaEntityinterstellar mediumEntityright ascensionEntitydeclinationEntityplanetary nebulaEntityEagle NebulaEntityLagoon NebulaEntitybibcodeEntityQ118398EntityTrifid NebulaEntityCategoriesPerseus (constellation)Planetary nebulaeSharpless objects