In today's image, we see a large, dense galaxy cluster known as the Coma Cluster. The cluster contains thousands of galaxies and is so large that it can take light millions of years to travel across the cluster.

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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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