time- peake(CNN)European Space Agency astronaut Tim Peake stepped outside the International Space Station on Friday, becoming the first to walk in space wearing the British flag.

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“Today’s exhilarating #spacewalk will be etched in my memory forever — quite an incredible feeling! ” Peake tweeted.

Peake, 43, was accompanied by U.S. astronaut Tim Kopra on the extravehicular activity (EVA) to replace a failed power regulator, install a valve and attach cables outside of the station, according to the space agency.

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The ESA live-tweeted the spacewalk with a blow-by-blow description of the astronaut’s moving along the station’s truss, unbolting the failed regulator and installing its replacement.

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