United States has the responsibility for developing
and ultimately operating major elements and systems
aboard the station. The U.S. elements include
three connecting modules, or nodes; a laboratory
module; truss segments; four solar arrays; a
habitation module; three mating adapters; a cupola;
an unpressurized logistics carrier and a centrifuge
module. The various systems being developed by
the U.S. include thermal control; life support;
guidance, navigation and control; data handling;
power systems; communications and tracking; ground
operations facilities and launch-site processing
The international partners, Canada,
Japan, the European Space Agency, and Russia,
will contribute the following key elements to
the International Space Station:
- Canada is providing a 55-foot-long robotic
arm to be used for assembly and maintenance
tasks on the Space Station.
- The European Space Agency is building a pressurized
laboratory to be launched on the Space Shuttle
and logistics transport vehicles to be launched
on the Ariane 5 launch vehicle.
- Japan is building a laboratory with an attached
exposed exterior platform for experiments as
well as logistics transport vehicles.
- Russia is providing two research modules;
an early living quarters called the Service
Module with its own life support and habitation
systems; a science power platform of solar
arrays that can supply about 20 kilowatts of
electrical power; logistics transport vehicles;
and Soyuz spacecraft for crew return and transfer.
In addition, Brazil and Italy are contributing
some equipment to the station through agreements
with the United States.
Source: NASA Human Space Flight Website