H II region

English

Alternative forms
  • HII region, HII region, H-II region

Etymology

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

Noun

H II region (plural H II regions)

  1. (astronomy) A large nebula of gas and plasma of glowing low density in which star formation has recently taken place.
  • HII emission line, HII emission line, H-II emission line
  • HI region, HI region, H-I region, H I region
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