One would imagine that if two galaxies ended up merging with each other, there would be a lot of interesting side effects. Unfortunately, those events usually take billions of years to occur.
Fortunately, we have computer simulations, as is the case from this video from NASA's Jet Propulsion Laboratory. In this video, we get to see the "merging of two massive galaxies, sped up to cover 1.5 billion years." The video provides two views - a visible-light view, "in which blue shows young stars and red indicates older stars and dust." The right-side view offers emission from dust, "which is what infrared telescopes like the Herschel Space Observatory see."
The Herschel Space Observatory is a European Space Agency mission (in which NASA participates), and the video was provided by Chris Hayward of the Heidelberg Institute for Theoretical Studies in Germany.
Keith Shaw rounds up the best in geek video in his ITworld.tv blog. Follow Keith on Twitter at @shawkeith. For the latest IT news, analysis and how-tos, follow ITworld on Twitter, Facebook, and Google+.