In today's image, we see one of the moons of Saturn, Helene. This is now as a Trojan moon which orbits at a Lagrange point - this is a stable position in the gravitational well of Saturn and one of its larger moons, Dione.

My podcasts are available in video form through this YouTube Channel.

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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