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| Astronomy Picture of the Day 25 September 2013 M81 Versus M82 |
Both of these galaxies are about 12 million light-years away and are having a close encounter. This close encounter is due to their longstanding gravitational struggle. This picture was constructed by 25 hours of image data in a deep telescopic snapshot. The violent star forming in M82 (right) is so energetic that it glows in X-rays. In a few billion years, only one galaxy will remain. This picture is incredibly interesting because it shows the vastness of the universe and how far away other galaxies truly are. Plus the galaxies look really cool.

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