In today's image, we see a shower of particles from a single, very high energy nucleus striking Earth's upper atmosphere. While these cosmic rays strike Earth all the time, this one was of exceptionally high energy and astronomers are trying to understand how it formed and where it came from.

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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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