The Dark Energy Survey (DES) is a joint project between the U.S. Department of Energy and the National Science Foundation to study the nature of dark matter and dark energy.  Dark matter and energy are believed to make up 95% of the universe, and their origin and composition are completely unknown. The DES built a new 520 mega-pixel CCD camera for an existing 4-meter telescope in Chile that will be used for a 5-year program of observations. These new observations of the southern-hemisphere sky will include 300 million galaxies, 120,000 galaxy clusters, and more than 3,000 supernova explosions. The first season for DES started in September 2013; work is now underway to analyze the newly discovered hundreds of supernovae! The DES group at Argonne National Laboratory is also involved in futuristic infrared-astronomy camera development, in collaboration with our Center for Nanoscale Materials.