KnowraHorsehead NebulaLinked fromLinked fromThe 7 pages that link to Horsehead Nebula, each with the reason it gives.All 7Broader topic 5Related 1Compared with 1AstrophotographyBroader topic: Its striking shape became recognizable through long-exposure images.Harvard College ObservatoryBroader topic: Fleming discovered it on a photographic plate at the observatory in 1888.Williamina FlemingBroader topic: Fleming identified it on a photographic plate in 1888.Dark nebulaBroader topic: Its silhouette shows a dense cloud outlined by bright background emission.Interstellar cloudBroader topic: Its familiar outline reveals how a dense cloud can block background light.