DARKNEBULA
Dark nebula
A dark nebula is a type of interstellar cloud that is so dense that it obscures the light from the background emission or reflection nebula or background stars . The extinction of the light is caused by interstellar dust grains located in the coldest, densest parts of larger molecular clouds. Clusters and large complexes of dark nebulae are associated with Giant Molecular Clouds. Isolated small dark nebulae are called Bok globules. Like other interstellar dust/material, things it obscures are only visible using radio waves in radio astronomy or infrared in infrared astronomy.The above text is a snippet from Wikipedia: Dark nebula
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dark nebula
Noun
- A type of nebula that unlike other types of nebulae does not emit or reflect light and therefore appears as a starless region in the sky.
- Horsehead Nebula is a typical dark nebula, and is famous for resembling the head of a horse.
The above text is a snippet from Wiktionary: dark nebula
and as such is available under the Creative Commons Attribution/Share-Alike License.