EntityQ2311388· pop 18· linked from 35 articlesvariable nebulaSign in to saveNebula with varying brightnessConnectionsnebulaEntitymolecular cloudEntityHubble Space TelescopeEntitydigital object identifierEntityInternational Standard Serial NumberEntityplanetary nebulaEntitybibcodeEntityQ118398Entitydark nebulaEntityH II regionEntityformation and evolution of the Solar SystemEntityemission nebulaEntitysupernova remnantEntityreflection nebulaEntityBok globuleEntityinterstellar cloudEntityNGC 2261EntityQ22908627EntityQ835928EntityH I regionEntityCategoriesNebulaeReflection nebulae