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Cool image time! The image to the right (reduced in resolution to show here) was posted today on the Cassini gallery page. The release focused on the bright spot in the widest ring just above the center of the image.
An ethereal, glowing spot appears on Saturn’s B ring in this view from NASA’s Cassini spacecraft. There is nothing particular about that place in the rings that produces the glowing effect — instead, it is an example of an “opposition surge” making that area on the rings appear extra bright. An opposition surge occurs when the Sun is directly behind the observer looking toward the rings. The particular geometry of this observation makes the point in the rings appear much, much brighter than would otherwise be expected.
I however am more interested in the black outline at Saturn’s limb that visually separates the planet from the rings. Is that natural or introduced intentionally in data processing to make the image more pleasing? If it is natural than I wonder how Saturn’s top cloud layer could produce such an opaque and sharply defined region able to so successfully block the light coming from the rings. If introduced intentionally I question the wisdom, as I can’t see any reason to do it and therefore am worried that they might have done some other unnecessary manipulation that makes it difficult to draw any honest conclusions from the image.
Either way, from an aesthetic perspective the image still remains breath-taking. It also underlines once again the amazing engineering that made it possible. All things remain possible, if we maintain our ability to build this kind of engineering.