In today's image, we see what are known as undulatus clouds appearing to converge over the telescopes domes on the mountaintop. These are clouds caused by the air currents in Earth atmosphere which give them their distinctive shape.

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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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