Tim Peake has become the first ever Briton to walk into space, during a history-making jump out of the International Space Station (ISS).
Major Peake ventured out of his temporary home to help repair a broken power unit, from 12.55 GMT on Friday.
Along with colleague Colonel Tim Kopra, the two left the space station for a six-and-a-half hour mission to make repairs to the outside of the station.
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Famous faces have already sent messages of support for the astronaut.
Prime Minister David Cameron said on Twitter hours before the spacewalk: "Good luck to astro-timpeake on today's £spacewalk."
He added: "The country will be watching you make history £ScienceIsGREAT."
Veteran rockers The Who, quoting their own lyrics, added: "Good luck astro-timpeake on your £EVA. Stay safe! £principia £spacerocks I can see for miles and miles and miles! Best wishes, TheWho."
Major Peake said "nothing can fully prepare (us) for the feeling of being outside of a spacecraft in the vacuum of space" as he completed the final preparations.
Additional reporting by agencies.
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