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Had a go doing the crescent nebula I see, You are going to have to reprocess the data, what I see suggests 2 things, firstly the stars have been over sharpened, and you have used some kind of a noise filter.
First calibrate your image with darks and flats ( if you don't have them do them ..... If you don't know how just ask), then take the calibrated image and use curves in Photoshop or similar, just lift it in the middle until you see a good amount of detail, then use the centre eyedropper in levels place in in the bare sky and balance the color, and slide the far left slider almost to the edge of the bell shaped curve. This is the simplest processing youmcould do, Post that and see if there's any improvement, a bit of noise is prefferable to removing detail with a filter. I hope this is taken in a positive light to help and inform.
Kind regards
Clive.
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