Washington: Britain's astronaut Tim Peake and his colleague, NASA astronaut Tim Kopra successfully restored full power to the International Space Station (ISS) on Friday.
However, the spacewalk ended early after Kopra reported water in his helmet.
“The crew is not in any danger whatsoever,” mission commentator Rob Navias said in a live broadcast of the spacewalk on NASA TV.
US astronaut Timothy Kopra took everyone by surprise when he reported a small water bubble and a few minutes later, a film of water, inside his helmet.
The astronauts had been outside the space station for four hours.
Major Peake, 43, and and Kopra, 52, switched their spacesuits on to battery power at 7:48 am (1248 GMT), marking the start of their spacewalk.
Friday's spacewalk, which was initially scheduled to last for six-and-a-half hours, was the first for Peake and the third for Kopra.
Peake, a former Army Major, created history today by becoming the first official British astronaut to walk in space.
Earlier, UK Prime Minister David Cameron wished Tim Peake good luck as he became Britain's first astronaut to a spacewalk debut.
— David Cameron (@David_Cameron) January 15, 2016
The ISS circles the Earth every 90 minutes, and spends 31 of those minutes in the dark.