KnowraRing NebulaLinked fromLinked fromThe 7 pages that link to Ring Nebula, each with the reason it gives.All 7Broader topic 4Compared with 3Planetary nebulaBroader topic: Its nearly ring-shaped appearance is a familiar example of projected nebular structure.Messier catalogBroader topic: M57 is a classic example of the compact nebulae Messier recorded.NebulaBroader topic: Its bright shell shows the late-stage mass loss that creates planetary nebulae.New General CatalogueBroader topic: Its NGC designation, NGC 6720, shows how the catalogue records objects later classified by their physical nature.