This image shows the Carina Nebula (NGC 3372), combining the light from 3 different filters tracing emission from oxygen (blue), hydrogen (green), and sulfur (red). The color is also representative of the temperature in the ionized gas: blue is relatively hot and red is cooler. This image was taken at the Curtis Schmidt telescope at the Cerro Tololo Interamerican Observatory.
Visit the NOAO image gallery for more file formats (http://www.noao.edu/image_gallery/html/im0667.html).
Credit: N. Smith, University of Minnesota/NOAO/AURA/NSF