In today's image, we see the small moon of Mars, known as Deimos. This moon is likely a captured asteroid that happened to wander into the gravitational field of Mars and become captured. Deimos was not discovered until about 150 years ago.

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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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