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Aaron, let's just say that for a digital camera, you are shooting way past it's ability. There are still certain things you can do with say, iso 6400 film that you cannot do with a digital camera because of the noise levels of the CCDs.
You make the issue a little worse because you want to retain the stars, which are similar in nature, size, and shape to much of the noise present from the shooting.
My feeling is that you would have make a number of steps with different products, and would likely have to accept some losses in the starfield to make the rest of the image work out. You may want to try first to extract just the starfield from the image (by selecting the sky area, and then running differentials or selecting by color / intensity to isolate the stars) and then processing the rest of the image through any number of despeckling products, finally re-introducing the starfield as a new layer and blending it in as you see fit.
The compressed jpeg version you posted is unworkable, but perhaps the original raw image has more hope... it is certainly an interesting push on the limits of the camera.
Alex
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