Page 51 - Curriculum Visions Dynamic Book

ArrAy A regular group or arrangement.
solAr cell A photoelectric device that converts the energy from the Sun (solar radiation) into electrical energy.
 Unity and Zarya (above) and Unity (below).
Timeline for assembly
Assembly of all of the 100 major components, required 40 space flights by the American and Russian teams.
The ISS is designed in modules so large that they have to be carried into space and assembled one by one. Furthermore, the contents and accessories for the modules have to be carried into space separately from the modules because they are themselves heavy and bulky.
The first flight was a Russian Proton rocket that lifted off in November 1998 and placed the Zarya module in orbit. In early December of that same year the Space Shuttle Endeavour carried the Unity module to Zarya. They were then attached. Thus two trips were needed to provide the core of the ISS.
The third ISS mission was in June 1999, with the Space Shuttle Discovery supplying the two modules with tools and cranes.
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