Definition of dark nebula in English:

dark nebula

Syllabification: dark neb·u·la

noun

Astronomy
  • A nonluminous nebula of dust and gas that is observable because it obscures light from other sources.
    More example sentences
    • In the inner regions of dark nebulae important events take place, such as the formation of stars and masers.
    • There are different forms of nebulas, dark nebulas, emission nebulas and celestial nebulas.
    • In the Cigar Galaxy, there are blank spots where it appears there are not any stars, just dark nebulas.

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Word of the day astrogation
Pronunciation: ˌastrəˈgāSHən
noun
(in science fiction) navigation in outer space