In today's image, we see the supernova remnant known as Cassiopeia A. This would have been seen to explode from Earth back in the later 1600. However, extensive obscuration kept astronomers from viewing it as a prominent supernova. Here we see it in a combination of visible light and x-rays.

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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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