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A simple solution whilst you are learning the basics of Photoshop is to simply use auto levels.;
image/adjustments/autolevels.
That probably will get a better result very easily.
What you want is a bell shaped histogram - that graph that shows the data of the image as a graph. Black clipped means to cut off the left part of that graph and that is the darker parts of the image and the faint dimmer nebula/image parts. So you get a high contrast very black background looking image but you lost a lot of the faint stuff as a cost.
So if you click on levels move that left hand slider further to the right. But you would have to do that with the original image not this saved one as that data is now lost except in the original.
Greg.
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