British astronaut Tim Peake made the nation's first spacewalk on Friday, leaving the International Space Station with US colleague Tim Kopra to undertake repairs to the outside of the orbital structure.
The European Space Agency, which trained Peake for his ISS mission, said the two men would replace a failed power unit, install a valve and attach cables to the space station during a planned six-hour operation.
Peake, 43, reached the space station last month after he and two other astronauts were launched on a Russian rocket from the Baikonur space centre in Kazakhstan.
During his six-month stay, the former test pilot plans to run the first marathon in space using a specially adapted running machine on the space station.
Peake's 42.195-kilometre treadmill run on the ISS will coincide with the London Marathon on April 24.
Peake, who once completed the London marathon in under three hours and 20 minutes, will be held by elastic straps attached to his shoulders to stop him floating away from the treadmill, ESA said.