H II region

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H II region

From Wiktionary, the free dictionary

English

English Wikipedia has an article on:

H II region

Alternative forms

H_II region, HII region, H-II region

Etymology

From a being region of space having H_II emission lines in its spectrum.

Noun

H II region (plural H II regions)

(astronomy) A large nebula of gas and plasma of glowing low density in which star formation has recently taken place.

Related terms

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