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Mare Serenitatis - Colour transistion

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I was out for half an hour last night and was spending most of my time on the prominent trio of craters Theophilus, Cyrillus and Catharina. It was only when I saw cloud approaching I switched to the eastern region of Mare Serenitatis. Rima Smirnov (aka the Serpentine Ridge) was very prominent.

I took a quick photo with my smartphone. It was only later I looked at it and it seems to show quite a pronounced and abrupt colour transition in the southern region of the Mare (I am sure the camera is artificially accentuating the colour tones). I have to admit, it didn't register when I was observing it at the scope. I did some reading and this area seems to be a noted area for this abrupt change in the colour of the lunar geology.



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Is that the camera rather than reality in play, it looks too linear to be reality.
Of course nature can throw a straight line in when it wishes.

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Yes it's a real change in minerology, I've looked at it quote a lot! This is a monochrome image but the albedo change can be seen


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