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Some star forming regions, like Bok globules (which contain stars that still haven't dispersed their molecular hydrogen and cosmic dust shell) appear dark compared to the rest of the H II in which they form. Does this happen because the star hasn't ionized and transformed the molecular hydrogen in ionized atomic one?

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    $\begingroup$ Although it's pronounced the same, I think you mean "H$_2$" (molecular hydrogen) rather than "H II" (ionized hydrogen). Also, the answer is yes. $\endgroup$
    – pela
    Commented Jul 13 at 9:12

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