In the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, the Ares I-X fifth segment simulator assembly (center right) joins other segments located in High Bay 4. Ares I-X is the flight test vehicle for the Ares I, the essential core of a safe, reliable, cost-effective space transportation system that eventually will carry crewed missions back to the moon, on to Mars and out into the solar system. Ares I-X is targeted for launch in August 2009. Photo credit: NASA/Kim Shiflett