What characteristic is shared by both Dark Nebulae and Molecular Clouds regarding their hydrogen state?
Answer
They both contain neutral ($ ext{H I}$) or molecular ($ ext{H}_2$) hydrogen.
The table indicates that Dark Nebulae contain Neutral ($ ext{H I}$) or Molecular ($ ext{H}_2$) hydrogen, and Molecular Clouds by definition contain molecular hydrogen ($ ext{H}_2$).
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