Enceladus' plumes,

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If we don't fly through this, we might as well stay at home.


http://www.planetary.org/blogs/guest-blogs...fe-on-mars.html

Seems to me most of that diffuse glow is scattered light in the optics.

I seem to see two shadow lines that are tangential to the curve. Perhaps the rest of the "diffuse glow" is real image with the moon's shadow projected against it, like distant cloud or landform shadows streaming across terrestrial sunset skies.