In today's image, we see M31 - otherwise known as the Andromeda Galaxy. This is the nearest large spiral galaxy to our own Milky Way and is actually nearly twice the size of the Milky Way. The Milky Way and Andromeda are on a collision course and will likely merge into a single large galaxy - more than five billion years from now!
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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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