CAPE CANAVERAL, Fla. – The Ares I-X launch abort system that will form the tip of the Ares rocket arrives in the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida. The launch abort system will provide safe evacuation if a launch vehicle failure occurs. Ares I-X is the test vehicle for the Ares I, which is part of the Constellation Program to return men to the moon and beyond. Ares I is 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 July 2009. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – In the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, an upper rail removed from high bay 3 rests on the floor. The removal is part of the modifications for the Constellation Program's Ares vehicles. The Ares I and Ares V rockets will be 325 feet and 360 feet tall, respectively, considerably taller than the space shuttle atop its mobile launcher platform. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – In the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, an upper rail is being removed in high bay 3 as part of the modifications for the Constellation Program's Ares vehicles. The Ares I and Ares V rockets will be 325 feet and 360 feet tall, respectively, considerably taller than the space shuttle atop its mobile launcher platform. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – In the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, an upper rail removed from high bay 3 is lowered onto the floor. The removal is part of the modifications for the Constellation Program's Ares vehicles. The Ares I and Ares V rockets will be 325 feet and 360 feet tall, respectively, considerably taller than the space shuttle atop its mobile launcher platform. Photo credit: NASA/Jack Pfaller

CAPE CANAVERAL, Fla. – In the Vehicle Assembly Building at NASA's Kennedy Space Center in Florida, an upper rail removed from high bay 3 is lowered onto the floor. The removal is part of the modifications for the Constellation Program's Ares vehicles. The Ares I and Ares V rockets will be 325 feet and 360 feet tall, respectively, considerably taller than the space shuttle atop its mobile launcher platform. Photo credit: NASA/Jack Pfaller