In today's image, we see at least five supernumerary rainbows in the image. These are causes when identically sized water droplets, less than a millimeter in size not only reflect light, but also cause interference between the light waves. This is something that can only happen if light behaves like a wave.

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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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