Download this video in several formats from: a class="link" rel="nofollow" href=" br br Description: br One of the big mysteries in astronomy is how galaxies grow and evolve over time. Collisions between galaxies are thought to be key events that shape their development. A stunning collection of 59 new images of colliding galaxies has been released to mark the 18th anniversary of the NASAESA Hubble Space Telescope. They give us a unique insight into how galaxies collide to form larger galaxies. br br Credit: br br ESAHubble (M. Kornmesser & L. L. Christensen) br br Narration: br Dr. J br br Design: br Martin Kornmesser br br Web Technical Support: br Lars Holm Nielsen br Raquel Yumi Shida br br Cinematographer: br Peter Rixner (a class="link" rel="nofollow" href=") br br Script: br Lars Lindberg Christensen, Raquel Yumi Shida br br Director: br Lars Lindberg Christensen br br Acknowledgements for the images used in this Hubblecast: br br * Project lead: Lars Lindberg Christensen br * Image processing: Davide de Martin (ESAHubble) and Zolt Levay (STScI) br * Cosmetic cleaning: Amit Kapadia, Nuno Marques, Maximilian Kaufl (ESAHubble) br * Colour correction and cosmetic adjustments: Zolt Levay (STScI) & Martin Kornmesser (ESAHubble) br * HST Principle Investigator: A. Evans (University of Virginia, CharlottesvilleNRAOStony Brook), and the PIs of Hubble Proposals 9735, 11091, 6276, 10575, 7129, 7467, 6438.