Here we watch as two spiral galaxies collide and create a third galaxy with a huge black hole at its center. The hole grows and grows until, with its enormous energy, it heats surrounding gases and hurls them out into the universe. The result [right] is an elliptical galaxy with very little gas and not much star creation. Researchers at the Max Planck Institute for Astrophysics illustrated this simulation using red to show the hottest gases and blue for the coldest. The brighter the color, the denser the gas.