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It is, but full Moon power output is spread over 0.5° diameter circle (on retina this is will be 0.05mm or so)
So power density on the retina can not exceed safe level, while star image (all that power concentrated on one small area) potentially could, because it will be concentrated on couple of cells only.
Also, I am presenting numbers for effects using 10" telescope. This will definitely be dangerous.
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