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Galaxy Collisions: Simulation vs Observations Images Credit: NASA, ESA; Visualization: Frank Summers (STScI); Simulation: Chris Mihos (CWRU) & Lars Hernquist (Harvard). Explanation: What happens when two galaxies collide? Although it may take over a billion years, such titanic clashes are quite common. Since galaxies are mostly empty space, no internal …

Here’s a neat method for saving money on AA 1.5 volt batteries. Takes a little effort, but depending on how many of these batteries you use, you could save a lot. Watch the video.