Together with NASA astronaut Tim Kropa they will exit the International Space Station at 12:55 GMT (13:55 CET) to replace a failed power regulator, install a valve and attach cables to the outside of the Station.
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And luckily for us, it is being streamed live so we can watch him make history.
Major Peake and Colonel Kopra successfully replaced the broken regulator box with a spare power unit, nicknamed “Dusty”, which arrived at the ISS in 1999.
The ISS circles the Earth every 90 minutes, and spends 31 of those minutes in the dark.
The European Space Agency (ESA) said every detail of the spacewalk has been “choreographed minutely”.
It will last nearly six-and-a-half hours.
Mission commander Scott Kelly (2nd R) oversees the return of astronauts Tim Peake (R) of Britain and …
The difference between the two Tims can be seen as Mr Kopra will don red stripes, and Mr Peake will have a Union flag embedded on the shoulder of his suit.
In a tweet sent on Monday, Major Peake posted an image of himself in the spacesuit he will wear for the spacewalk, saying “feels just great”.
Then they will be able to take off their suits and adjust to the pressure back in the station.
They are usually carried out to complete repairs or gather material for experiments.
He’ll be joined by the orbiting outpost’s other Tim – NASA ‘naut Kopra, who’ll be embarking on his third EVA.
When an astronaut leaves a vehicle while in space, usually to carry out repairs, maintenance or experiments, he is said to perform a spacewalk.
He said: “He trained a lot to do it specifically in a huge pool at the space centre in Houston where they dive for up to six hours at a time in a full scale mock-up of the ISS – he was longing for the chance”.
Deep sea diving enthusiasts would have some understanding of what a pressurised suit feels like in space, he said, adding: “The difficulty is, there has to be rigidity”.
“You are really working against that pressure, you’ve got limited visibility, but you’ve practiced lots so you know how to move and you know how to get around”.
He’s carrying out the assignment, attached to the ISS with a steel cord, alongside Nasa astronaut (and namesake) Tim Kopra.
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The International Space Station is expected to remain in operation until 2024.
