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Reduce the exposure time - you are probably over-exposing, so all the camera can capture is a "blown-out" white blob.
I find it is handy to have the camera exposure set quite long for initially acquiring a target, so that the planet / stars you want to capture are easy to find, but once you have it centred and tracking, on bright targets like the Moon and the brighter planets, you need to cut the exposure back until the white blob starts to show some detail and colour, and then you can "fine tune" to see what settings for exposure time and gain etc work best for you on each target.
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