In today's image, we see the north polar region of Saturn as imaged by the Cassini spacecraft. The polar hexagon was first seen by the voyager craft in the 1980s and is apparently unique to Saturn. It is unusual in its regularity and how well-defined it is. In addition, most shapes on planets tend to be oval or circular so a six-sided shape is quite unusual.

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This Podcast is an authorized New Media Mirror Site for APOD. You can access the image and website directly at: Astronomy Picture of the Day. You can use the archive link below the image to select the photo corresponding to the date of this podcast.

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