National Aeronautics and Space Administration (NASA) Engineers at Marshall Space Flight Center, and their partners at other NASA centers and in private industry, are designing and beginning to develop the next generation of spacecraft to transport cargo, equipment, and human explorers to space. These vehicles--the Ares I and Ares V launch vehicles--are part of the Constellation Program, which is carrying out a bold vision of human space exploration. The program also includes a crew exploration vehicle. The NASA Authorization Act of 2005 directs NASA to establish a program to develop a sustained human presence on the Moon, which will serve as a stepping stone to further exploration of Mars and other destinations. This design challenge focuses on the Ares family of launch vehicles, which will replace the Space Shuttle orbiter in the task of putting people, satellites, and scientific experiments into space. (Contains 23 figures and lists 17 resources.)