KnowraRosette NebulaLinked fromLinked fromThe 3 pages that link to Rosette Nebula, each with the reason it gives.All 3Broader topic 2Compared with 1H II regionBroader topic: Its ring-like cavity illustrates expansion of an H II region into a molecular cloud.Orion NebulaCompared with: Its cavity-centered structure contrasts with M42’s compact, bright central region.Emission nebulaBroader topic: Its central cluster has excavated and ionized the surrounding gas into a clear cavity and shell.