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If you were in it, you probably wouldn't see it too well at all.
Think of it like walking in a fog with a flashlight, the first few feet looks clear, even though you are "in" the fog itself. Only once you have looked through a distance of it, does it start to become more opaque.
Now imagine that fog is 1500 light-years across and really thin. Now take away the flashlight.
Get an idea?
Baz.
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