In today's image, we see an example of a simulation showing the formation of a galaxy cluster. Because the formation of a galaxy cluster takes such a long time - billions of years, we can never watch one form directly. However, we can use simulations to better understand the formation.
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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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