@jason, what is Dark...

I believe that Dark is nothing.
For example if you turn the lights of, you see black.
Why? Simply because there is no light, no light = black (of course if you turn of the lights you will see some things, but that is reflection).

It depends on how you define Dark yourself.
Are you talking about Dark itself or i.e. Dark in the space.
Because Dark in the space is just the result of no light, but inside there is something, for example gasses and stuff.

So, I think it matters how you define Dark...
And I define Dark as Dark itself.
If you do not believe this, what do you think that Dark is then?

[size=7px]Notice that I only say what I believe...[/size]