Galaxies collide, merge, and birth new stars as a result. This image, in celebration of Hubble's 18th birthday, features 59 different galactic collisions in remarkable detail.
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Acknowledgment: A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook University), W. Keel (University of Alabama, Tuscaloosa), K. Noll, B. Whitmore and M. Stiavelli (STScI), G. Ostlin (Stockholm University), and J. Westphal (Caltech)