Altitude Control and Booster Module: The attitude control and booster module provides limited power, limited life support, and additional connecting ports. Its main purpose is to control the position and orbit of a space station. Crew Quarters Module: The crew quarters module provides living quarters for the first three person crew. Solar Power Array: The solar power array collects massive amounts of solar energy for the station and stores it in batteries. Storage and Docking Module: The storage and docking module holds fuel and other supplies. It also provides limited power and connecting ports for other modules.