An H II region is a cloud of ionized hydrogen in interstellar space, which is typically associated with star formation. The term "H II" signifies that the hydrogen in these regions has been ionized, which means that the hydrogen atoms have lost their electrons due to the high-energy ultraviolet radiation emitted by nearby hot, young stars. H II regions are often found surrounding young, massive stars, where the intense radiation and stellar winds from these stars ionize the surrounding hydrogen gas.
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