bn:01340981n
Noun Concept
Categories: Nebulae, H II regions, Articles with short description
EN
H II 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
Large, low-density cloud of partially ionized gas Wikidata
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