Nebula
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A nebula (Latin for "cloud" or "fog"; pl. nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, the term was used to describe any diffuse astronomical object, including galaxies beyond the Milky Way. The Andromeda Galaxy, for instance, was once referred to as the Andromeda Nebula (and spiral galaxies in general as "spiral nebulae") before the true nature of galaxies was confirmed in the early 20th century by Vesto Slipher, Edwin Hubble and others.
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See also
- H I region
- H II region
- List of diffuse nebulae
- Lists of nebulae
- Molecular cloud
- Magellanic Clouds
- Messier object
- Nebula Award
- Nebulae in fiction
- Nebular hypothesis
- Orion Molecular Cloud Complex
- Timeline of knowledge about the interstellar and intergalactic medium
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