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Published on Dec 13, 2010
This simulation follows the collision of two spiral galaxies that harbor giant black holes. The collision merges the black holes and stirs up gas in both galaxies. The merged black hole gorges on the feast and lights up, forming an active galactic nucleus called a quasar and creating a "wind" that blows away much of the galaxy's gas.
Video property of NASA.
Fun to know this will happen to our own galaxy colliding with the Andromeda galaxy in a few billion years!