H II region

短语

词形变化

H II regions 复数 H II regions

别名

H_(II) region HII region

释义与例句

n.
  1. 1.

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

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词源

From a being region of space having H_(II) emission lines in its spectrum.

来源：wiktionary