In today's image, we see a simulation which shows the distribution of dark matter in the universe. Dark matter is needed to explain things like the rotation of galaxies, motions of galaxies in clusters and the extent of gravitational lensing.
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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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