Pakistan, Aug. 19 -- NASA astronaut Anil Menon and ESA astronaut Sophie Adenot are set to conduct a spacewalk outside the International Space Station. They will replace a key communications antenna linking the station with mission controllers on Earth.

The spacewalk, designated US Spacewalk 97, is scheduled to begin at 8:35 a.m. EDT. NASA said the astronauts are expected to spend about six and a half hours outside the station. They will work from the Quest airlock and along the Z1 truss.

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Their main task will involve removing a failed Space-to-Ground antenna and installing a spare. The antenna provides a high-speed communications link between the ISS and NASA's Mission Control Centre in ...