Russian and US cosmonauts aboard the International Space Station (ISS) started a spacewalk on Tuesday, the Mission Control Centre near Moscow said.
The ISS commander American Michael Fincke and Russian engineer Yury Lonchakov opened the station's hatches and launched extravehicular activities (EVA) at 7:22 p.m. Moscow time (1622 GMT) on Tuesday, a source with the Mission Control was cited as saying by the Itar-Tass news agency.
The spacewalk will last for five hours and 45 minutes, the report said.
The astronauts are expected to install and connect gadgets for the Expose-R experiment on the outer surface of the ISS.
They will also fulfil a number of technical missions, which they had no time to accomplish during their first spacewalk in December 2008.