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l not be launched all at once. Its components are too large, built by too many different countries, to fit on a single rocket. Instead it is assembled piece by piece, the way the International Space Station was assembled over many years beginning in the late 1990s. The first element of Gateway is called the Power and Propulsion Element. It provides electrical power and the ability to maneuver in orbit. It is relatively modest by space station standards, but it is the seed from which everything