US astronauts, Reid Wiseman and Barry Butch Wilmore.
Washington:
A pair of American astronauts stepped outside the International Space Station on Wednesday on a spacewalk to do repairs and upkeep at the orbiting outpost, the NASA said.
Reid Wiseman and Barry "Butch" Wilmore began their spacewalk at 8:16 am (1216 GMT), starting an excursion that is scheduled to last six and a half hours.
"During today's spacewalk, Wiseman and Wilmore will replace a voltage regulation device called a sequential shunt unit and relocate camera and television equipment," the NASA said in a statement.
The spacewalk is being broadcast live on NASA's television and website.