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Galactic Collisions 3 This visualization shows two spiral galaxies - each with supermassive black holes at their center - as they collide. In this simulation, the brightness represents gas density while the color indicates temperature in the gas distribution. The latest Chandra results suggest that such collisions may cause extreme black hole and galaxy growth in the early Universe, setting the stage for the birth of quasars. The time scale shown in the upper left of the simulation represents millions of years. Tags: galactic evolution spiral galaxies supermassive black holes gas