LIVE: Watch Tim Peake's spacewalk here
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Major Peake, from Westbourne, near Chichester is due to start his historic walk at around 12.55 GMT.
He will exit the International Space Station with NASA astronaut Tim Kropa to replace a failed power regulator, install a valve and attach cables to the outside of the Station.
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Hide AdThe whole thing is being streamed live on NASA TV, including the build-up which has already begun.
Click here to watch it live.
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