The image generated by a supercomputer simulation (l) bears similarities to a telescope image of a cloud of gas being heated by bright, massive stars in the Large Magellanic Cloud, a nearby galaxy. In the simulation image (l), cold, high-density gas is blue; warm low-density gas is red; and intermediate density and temperature gases are light blue, green and yellow. In the image of a the 30 Doradus nebula (r) warm, diffuse gas is green; cold, dense gas is brown; and regions with no gas are black
