BEYOND THE MOON:A NEW ROADMAP FOR HUMAN SPACE EXPLORATION IN THE 21ST CENTURY

摘要

As the first decade of the 21st century draws to aclose, the United States is poised at the thresholdof unprecedented transitions and possibilities.More so than at any time since the end of the Cold War,the United States now has before it important opportuni-ties to establish new directions for the nation and to helpset the world down the path to a brighter, safer future.