Keith's note: NASA 2011 Budget information is now online at OMB: "NASA's Constellation program - based largely on existing technologies - was based on a vision of returning astronauts back to the Moon by 2020. However, the program was over budget, behind schedule, and lacking in innovation due to a failure to invest in critical new technologies. Using a broad range of criteria an independent review panel determined that even if fully funded, NASA's program to repeat many of the achievements of the Apollo era, 50 years later, was the least attractive approach to space exploration as compared to potential alternatives. Furthermore, NASA's attempts to pursue its moon goals, while inadequate to that task, had drawn funding away from other NASA programs, including robotic space exploration, science, and Earth observations. The President's Budget cancels Constellation and replaces it with a bold new approach that invests in the building blocks of a more capable approach to space exploration."
Page 18: National Aeronautics and Space Administration: "The Administration proposes to cancel the Constellation Systems program intended to return astronauts to the Moon by 2020 and replaces it with a bold new approach that embraces the commercial space industry, forges international partnerships, and develops the game-changing technologies needed to set the stage for a revitalized human space flight program and embark on a 21st Century program of space exploration."