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In PS, select all, then copy (contl C), then paste (contl V) . then you will have 2 layers . Set the top layer to "darken", select the shift tool, move it with the keyboard arrow keys in the desired direction to make the stars round (you are moving the top layer relative to the lower layer, any difference is "darkend"). When done (with round stars), select layers merge down to make a single layer again (thats the round star stuff done). Then, in yr case, select "colour select", and click on a star, then click on Add selection tool in colour select box and click on a few dimmer stars and then adjust slider until you have all the stars selected, then select modify and increase the selection by 4 pixels or so, then feather the selection by 2 pixels (to smooth further processing) You will notice all the stars are selected, but also the galaxy. Select lasso tool, then (with ALT key down, the cursor will show a - symbol) draw round the galaxy and realease the mouse key, the Galaxy will be excluded from the selection. What you have now is only the stars selected. Now select (Image, adjustments, desaturate) and all colour in the selection (stars) will be B/W. this last step is cheating, eliminates any colour in the stars to white.
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