bn:01340981n
Noun Concept
Categories: Articles with short description, H II regions, Nebulae
EN
H II region  H+ region  H II  H II nucleus  HII region
EN
An H II region or HII region is a region of interstellar atomic hydrogen that is ionized. Wikipedia
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EN
An H II region or HII region is a region of interstellar atomic hydrogen that is ionized. Wikipedia
A region of interstellar atomic hydrogen that is ionized Wikipedia Disambiguation
Large, low-density cloud of partially ionized gas Wikidata
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