In today's image, we see Neptune and its large moon Triton as timed by the Voyager 2 spacecraft back in 1989. Voyager 2 is the only spacecraft to have visited the outermost planet in the solar system. In order to see an object as a crescent, one needs to have traveled out beyond that object and be able to look back toward the Sun.

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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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