In today's image, we see an image of clouds on Earth known as nacreous clouds. These form in the lower stratosphere which usually has no clouds when the temperatures are very low, forming ice crystals.

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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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