Initial assembly of the fourth Ariane 5 for liftoff in 2010 has begun in the Spaceport’s Integration Building. The build-up of this latest vehicle began earlier this week with the erection of its core cryogenic stage. The next step is the mating of the launcher’s two solid rocket motors, which are installed on each side of the core cryogenic stage. This will be followed by a “topping off” of the vehicle with its ESC-A cryogenic upper stage and the vehicle equipment bay.