Back H I-gebied Afrikaans منطقة هيدروجين I Arabic एच वन इलाका Bihari H I područje BS Regió H I Catalan Oblast H I Czech H-I-Gebiet German Περιοχή H I Greek H I region English Región H I Spanish
La locuzione regione H I (regione acca primo) identifica una classe di nubi interstellari costituita da idrogeno neutro monoatomico (H I).
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