The largest window built for use in space has been completed, promising to give astronauts a spectacular view from the International Space Station.

The 80cm-wide window is one of seven fitted to an observation dome called Cupola, which will be attached to the ISS in January 2009.

Cupola has six trapezoid-shaped side windows around the large, circular one.

The new dome is designed to allow astronauts to control the robotic arm on the outside of the space station.

The Cupola measures 2m in diameter and 1.5m in height and will be attached to Node-3 before the end of the decade. Node-3 is a new module designed for the ISS, and is currently still being assembled.

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