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That's a very fine image Russell!! Nicely processed too. Well done!
The simplest way to process everything except stars is (in CS5) to Select->Color Range and then select the cores of a number of stars from bright to dim (use the shift key to add-select). Adjust the fuzziness to taste and hit OK. Then, from the adjustment pane, add a curves layer. It will automatically create a layer with a layer mask that shows only the stars. Click on the layer mask and from the masks pane, press Invert. You can now adjust curves without affecting stars. You may need to blur the layer mask to avoid sharp outlines or halos around stars. You can also Alt->Select the Layer mask itself and operate on it with curves to increase or decrease contrast. And don't forget the Shadow /Highlights tool (using the same layer mask).
Cheers, Marcus
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