Galaxy Wars: M81 vs M82 4.1

This week, I chose to do the photograph that contains the two galaxies M81 and M82. These two galaxies have been tearing each other apart by the force of their gravity for the past billion years, over the course of numerous hundred-million year periods in which they are located close to each other. Last time, M82 caused density waves to ripple around M81, which made the spiral arms of M81 extremely spectacular. On the other hand, M81 left M82 with violent star forming regions and colliding gas clouds, so violent that the galaxy literally glows with X-Rays. A few billion years from now, the battle between the galaxies will be finished and only one will remain.