What are the dark zones in Elite: Dangerous?

In some parts of Elite Dangerous space you can see distant black smudges between you and the bright galactic disk. If you find them on the galactic map they are described as Dark Zones, but the nearest is something like 450LY away.
What are they? Are they worth gearing up an explorer vessel to go and visit?
Best Answer
@Smeznaric is pretty much correct. The dark areas are dust clouds and\or nebulae that have not compressed enough to generate the thermal energy to start glowing. Flying into one of these dark areas has the effect of essentially blacking out the rest of the galaxy from your view, leaving you in a very dark place.
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