The orbit is what can really be called a "shuttle". It is the heart and brain of the system. It is the real vehicle that takes people into space and brings them back. There is a crew section on the front body where astronauts are transported. It can carry about 7-8 crew members. In the middle, there is an area where materials can be transported into space, if any. The stern also holds the orbital maneuvering system, main engines and vertical tail.
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