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 NASA/ESA Hubble Space Telescope. They give us a unique insight into how galaxies collide to form larger galaxies. Credit: ESA/Hubble (M. Kornmesser & L. L. Christensen) Narration: Dr. J Design: Martin Kornmesser Web Technical Support: Lars Holm Nielsen Raquel Yumi Shida Cinematographer: Peter Rixner (www.perix.de) Script: Lars Lindberg Christensen, Raquel Yumi Shida Director: Lars Lindberg Christensen Acknowledgements for the images used in this Hubblecast: * Project lead: Lars Lindberg Christensen * Image processing: Davide de Martin (ESA/Hubble) and Zolt Levay (STScI) * Cosmetic cleaning: Amit Kapadia, Nuno Marques, Maximilian Kaufl (ESA/Hubble) * Colour correction and cosmetic adjustments: Zolt Levay (STScI) & Martin Kornmesser (ESA/Hubble) * HST Principle Investigator: A. Evans (University of Virginia, Charlottesville/NRAO/Stony Brook), and the PIs of Hubble Proposals 9735, 11091, 6276, 10575, 7129, 7467, 6438. * Astronomical processing pipeline: The STScI ACS team * Data Archiving and pipeline implementation: The ESO/ST-ECF Archive and the STScI Archive Download this video on: