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horsehead nebula
Dark Horsehead Nebula
Dark nebulae neither emit nor reflect light; instead they block light from beyond.  They too have dust and gas, but the particles screen out the light from stars and nebulae that are behind it.
Credit: Arne Henden , US Naval Observ., Flagstaff, Image Processed by Al Kelly
For details, see page 6 of the Astronomy transparencies here.

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