Today’s choice of wallpaper will come as no surprise to anyone (except perhaps my colleagues at the university, who don’t seem to care how I spent my Thanksgiving). I love this photo for its symmetry—the United Launch Alliance Atlas V rocket with the Mars Science Laboratory hovers above the launch pad, perfectly aligned with the towers of its lightning protection.
You can download the full size of this photo by clicking on the image above. It is also available in 1600×1200, 1024×768, and 800×600 formats in the NASA Image of the Day Gallery (currently image 4, but the gallery changes by the day, so you might have to click through a few photos to find it).