Ok I don't see the color in this so much but apparently astronomers are very excited about it because they put color on it with infrared and red and violet filters. I mean I see a slight random blue tinge to some of the craters but that's about it. Apparently the blue craters are the newer ones, but it doesn't describe why they're blue. This picture was shot but the Messenger spacecraft. Perseus says that it's because the chemical composition is different in the new craters, which I understand because it's a false color photo, I just don't get why the newer craters would have a different chemical make up than new craters. However apparently astronomers can't figure it out either so whatevs :D
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