The Space Shuttle was NASA's partially reusable low Earth orbital spacecraft. It included the Orbiter Vehicle, a pair of recoverable solid rocket boosters (SRBs) and the expendable external tank containing liquid hydrogen and liquid oxygen. The Shuttle was launched vertically, like a conventional rocket, with the two SRBs operating in parallel with the OV's three main engines, which were fueled from the ET. NASA designed six Orbiter vehicles and named them, in order: Enterprise, Columbia, Challenger, Discovery, Atlantis, and Endeavour. The Space Shuttle was retired from service upon the conclusion of Atlantis' final flight on July 21, 2011. This high-quality replica is crafted from plastic and comes with a wooden base. The length is 11" and the wingspan is 4-1/2".