Archives for April 16, 2009

When Four Galaxy Clusters Collide!

It seems like it was just last week that I wrote about colliding dark matter, showing what happens when two galaxy clusters collide. Well, nature has gone and one-upped me. Let me explain. Galaxy clusters are huge conglomerations of matter: normal matter (protons, neutrons, electrons, etc.) and dark matter (this mysterious, non-collisional stuff). We find…