In today's image, we see a part of the remnant of a supernova that was seen here on Earth over a thousand years ago. The material has been expanding outward all that time and still has enough energy to excite and ionize atoms in the interstellar material that it passes though.

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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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