The spacecraft consists of two parts: the descent module and the instrument compartment. Instrumentation Bay - the heart of the spacecraft. There are brake the propulsion system, the fuel for her, devices, through which the astronauts do research work. In the descent module, which is a small cabin, the astronauts are during takeoff and landing, but here they work and play. In the descent module is the access hatch and portholes, through which the astronauts are watching. And Luke, and Windows tightly closed. On the orbit space ship delivers the rocket, but he descends with brake motor installation.