The US space agency, NASA is set to launch the world's largest rocket on Tuesday. The 327-foot rocket, called the Ares I-X, is set to launch from Kennedy Space Center in Florida. The empty rocket will help NASA collect information for future missions. This will bring NASA one step closer to its exploration goals to return to the moon for ambitious exploration. The space agency hopes the rocket eventually will replace the aging space shuttle and conduct voyages to the moon and Mars. NASA researchers, however, have said that a trip to the moon could not happen before 2015.