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I've attached the results of a quick level tweak (I turned down saturation a bit too). After resizing and jpeg-ing it does not look as good but still you can see the structure of the Milky Way.
I don't know about PS, but in the Gimp you go to "Levels" (Layers -> Colours -> Levels) and then you get a pop-up level-tweak box like in the second pic I've attached. You can pick the black level from the pic using the eyedropper and then tweak the gamma, that's the middle number, 1.00 in the pic. PS will have something very similar to this dialog.
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