Dark nebulae appear dark because they

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      absorb ultraviolet radiation
      are under low pressure
      are in a pure vacuum
      are not close enough to a bright star
      are not big enough
asked Mar 12, 2013 in Earth Science by anonymous
    

1 Answer

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are not close enough to a bright star
answered Mar 15, 2013 by h20 ~Top Expert~ (6,320 points)

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