[This answer](https://space.stackexchange.com/a/37817/12102) to *Farthest distance to a solar system object that's been measured by radar?* mentions that Saturn's rings, and the Uncover Travel post [Arecibo Observatory, Puerto Rico – The World’s Largest Radio Telescope For Over 50 Years](http://uncover.travel/arecibo-observatory-puerto-rico-the-worlds-largest-radio-telescope-for-over-50-years/) mentions:

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> Among other accomplishments of the Arecibo Observatory are:
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> * Direct imaging of an asteroid for the first time in history.
> * Discovery of water ice deposits at Mercury’s poles.
> * Tracking of near-Earth asteroids to monitor impact risks.
> * Mapping the cloud-covered surface of Venus.
> * **Radar imaging of the rings of Saturn, revealing new details of the ring structure.**
> * **First detection of methane lakes on Titan, a moon of Saturn.**
> * First detection of an asteroid with a moon.
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**Question:** How did Arecibo detect methane lakes on Titan, and image Saturn's rings? These are pretty remarkable feats from Earth for a single radiotelescope. How were they done? Can citations be found and the examples of the image of the rings and methane lake evidence be shown?