Titan behind Saturn's rings. Rings are viewed edge-on.
https://cdn.masto.host/deepspacesocial/media_attachments/files/109/391/692/512/412/620/original/0d909d9ba4ec4131.jpg
It's such a simple thing but it's so very beautiful, when moons and other planetary bodies come together. And the camera team lead by @carolynporco for Cassini were absolute masters at catching these events.
Images: NASA/JPL-Caltech/SSI/CICLOPS/Kevin M. Gill
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