KnowraPlanetary nebulaLinked fromLinked fromThe 32 pages that link to Planetary nebula, each with the reason it gives.All 32Broader topic 9Related 10Narrower topic 6Compared with 7Supernova remnantCompared with: Unlike a supernova remnant, it forms through gradual envelope ejection rather than a stellar explosion.Exoplanet atmosphereCompared with: Despite its name, a planetary nebula is a stellar remnant, not a planet’s atmosphere.Emission nebulaCompared with: It can emit bright lines, but its gas was expelled by a dying star rather than ionized around a young one.Herbig–Haro objectCompared with: It is also a glowing nebula, but comes from an evolved star rather than a protostar.Reflection nebulaCompared with: Despite its name, it is a stellar ejecta shell, not a dust cloud reflecting nearby stars.Ring galaxyCompared with: Its apparent ring is a small stellar remnant, not a galaxy-scale structure.Circumstellar discCompared with: It is an outflowing stellar envelope, not a flattened orbiting disc.