In today's image, we see two galaxies in the process of colliding together. When galaxies collide, their gravitational fields interact so that material is pulled out in streams as we see around the galaxy on the left. The process also takes a very long time - hundred of millions of years - so we only see a single snapshot of the collision.

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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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