Synonyms:
- Black Magellanic Cloud,
- Crab Nebula,
- angry clouds,
- black cat,
- black clouds,
- bright diffuse nebula,
- broken mirror,
- coalsack,
- dark nebula,
- diffuse nebula,
- dust cloud,
- gaseous nebula,
- gathering clouds,
- halcyon bird,
- nebula,
- nebula of Lyra,
- nebular hypothesis,
- nebulosity,
- nebulous stars,
- owl,
- planetary nebula,
- rainbow,
- raven,
- ring nebula,
- shooting star,
- storm clouds,
- stormy petrel,
- the Coalsack,
- thundercloud,
- thunderhead