VV 340, also known as Arp 302, provides a textbook example of colliding galaxies seen in the early stages of their interaction.
The edge-on galaxy near the top of the image is VV 340 North and the face-on galaxy at the bottom of the image is VV 340 South. Millions of years later these two spirals will merge -- much like the Milky Way and Andromeda will likely do billions of years from now. Data from NASA's Chandra X-ray Observatory (purple) are s
Source:
http://www.nasa.gov/images/content/579141main_vv340_1920_full.jpg
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