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The six-hour spacewalk involves upgrading the orbiting lab with new experiments to measure charged particle interactions and the effects of microbes on spacecraft materials

By Megan Gannon and SPACE.com

Russian cosmonauts Roman Romanenko (bottom) and Pavel Vinogradov flout outside the International Space Station on April 19, 2013, during the first spacewalk of their Expedition 35 mission. The two men will spend six hours upgrading the station' Image: NASA TV

Two Russian cosmonauts ventured outside the International Space Station Friday (April 19) to begin a six-hour spacewalk to upgrade the orbiting lab with new experiments.

Clad in their bulky Orlan spacesuits, veteran cosmonauts Pavel Vinogradov and Roman Romanenko began their spacewalk just after 10 a.m. EDT (1400 GMT) to install a space weather experiment to the space station's hull and prepare the outpost for the arrival of a robotic cargo ship later this year. You can watch the spacewalk live on SPACE.com, courtesy of NASA TV.

"It's dark outside," one of the cosmonauts said after they opened the hatch of the Pirs docking module, which doubles as a spacewalk airlock and spacecraft parking spot at the station. [Space Station's Expedition 35 Mission in Photos]

The spacewalk's first task is the installation of a new Russian experiment called Obstanovka, which will measure charged particles interact with a variety of materials kept outside of the space station. Obstanovka could offer scientists new insights about how space weather affects the ionosphere, an active region of the Earth's atmosphere, NASA officials explained in a spacewalk description.

Vinogradov and Romanenko also plan to retrieve a Biorisk canister, an experiment that measures the effects of bacteria and fungus on spacecraft materials, as well as part of a materials exposure experiment called Vinoslivost.

"All this is hard work," Romanenko said of the spacewalk in a NASA interview before launching to the station in December. "Also I'm supposed to collect information from other experiments that were installed outside the station."

Vinogradov and Romanenko are also expected to replace a faulty retro-reflector device needed to guide the upcoming arrival of the European Space Agency's Automated Transfer Vehicle 4 an unmanned cargo ship named "Albert Einstein." That robotic spacecraft will launch toward the space station in Juneand park itself at the orbiting laboratory's Russian-built Zvezda service module.

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Cosmonauts Take Spacewalk Outside Space Station

NASA TV

Russian cosmonauts Roman Romanenko (bottom) and Pavel Vinogradov float outside the International Space Station on Friday during a spacewalk.

By Marcia Dunn, The Associated Press

CAPE CANAVERAL, Fla. A 59-year-old Russian cosmonaut became the world's oldest spacewalker Friday, joining a much younger cosmonaut's son for a little maintenance work outside the International Space Station.

Pavel Vinogradov, a cosmonaut for two decades, claimed the honor as he emerged from the hatch with Roman Romanenko. But he inadvertently added to the booming population of space junk when he lost his grip on an experiment tray that he was retrieving toward the end of the 6-hour spacewalk.

The lost aluminum panel 18 inches by 12 inches (45 by 30 centimeters) and about 6 pounds (3 kilograms) contained metal samples. Scientists wanted to see how the samples had fared after a year out in the vacuum of space.

Otherwise, the spacewalk went well, with the spacewalkers installing new science equipment and replacing a navigation device needed for the June arrival of a European cargo ship.

Collecting the experiment tray was Vinogradov's last task outside.

The tray drifted toward the solar panels of the main Russian space station compartment, called Zvezda, Russian for Star. Flight controllers did not believe it struck anything, and the object was not thought to pose a safety hazard in the hours and days ahead.

"That's unfortunate," someone radioed in Russian.

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During space station fix-up, Russian becomes world's oldest spacewalker

By Irene Klotz

CAPE CANAVERAL, Florida (Reuters) - A pair of Russian cosmonauts wrapped up a 6-1/2 hour spacewalk outside the International Space Station on Friday, the first of up to eight outings this year to install experiments and prepare the orbital outpost for a new module, officials said.

Flight engineers Pavel Vinogradov, 59, a veteran of seven spacewalks and Roman Romanenko, 41, a second-generation cosmonaut on his debut spacewalk, floated outside the station's airlock at 10:03 a.m. EDT/1403 GMT as the station soared 262 miles over the southern Pacific Ocean.

The primary purpose of the 6-1/2 hour excursion was to set up an experiment that monitors plasma waves in Earth's ionosphere, the outer layer of the planet's atmosphere that extends to about 370 miles into space.

Instruments on two boxes attached to handrails on the forward portion of the station's Zvezda module will measure low-frequency electromagnetic radiation, which, among other triggers, has been tied to earthquakes.

At the other end of the Zvezda module, Vinogradov and Romanenko replaced a faulty laser retroreflector that is part of an automated docking system used by the European Space Agency's cargo transports. The next ship is due to launch in June.

Before heading back into the station, the cosmonauts retrieved another experiment designed to study how microbes affect spacecraft structures and whether microbes are affected by solar activity.

The day's only glitch occurred just before the men wrapped up their six-hour, 38-minute spacewalk. Vinogradov lost his grip on a science experiment that was slated to be returned to Earth. It floated away in the gravity-free world of space.

The lost aluminum panel, which measured about 18 inches by 12 inches and weighed about 6.5 pounds (3 kg), had been anchored outside the station to test how various metals wear in the harsh space environment.

It floated off in the direction of the Zvezda module's solar arrays, but engineers determined it did not hit or threaten the station, NASA mission commentator Rob Navias said.

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Cosmonauts tackle equipment installation outside space station

NASA TV

Russian cosmonauts Roman Romanenko (bottom) and Pavel Vinogradov float outside the International Space Station on Friday during a spacewalk.

By Marcia Dunn, The Associated Press

CAPE CANAVERAL, Fla. A 59-year-old Russian cosmonaut became the world's oldest spacewalker Friday, joining a much younger cosmonaut's son for a little maintenance work outside the International Space Station.

Pavel Vinogradov, a cosmonaut for two decades, claimed the honor as he emerged from the hatch with Roman Romanenko. But he inadvertently added to the booming population of space junk when he lost his grip on an experiment tray that he was retrieving toward the end of the 6-hour spacewalk.

The lost aluminum panel 18 inches by 12 inches (45 by 30 centimeters) and about 6 pounds (3 kilograms) contained metal samples. Scientists wanted to see how the samples had fared after a year out in the vacuum of space.

Otherwise, the spacewalk went well, with the spacewalkers installing new science equipment and replacing a navigation device needed for the June arrival of a European cargo ship.

Collecting the experiment tray was Vinogradov's last task outside.

The tray drifted toward the solar panels of the main Russian space station compartment, called Zvezda, Russian for Star. Flight controllers did not believe it struck anything, and the object was not thought to pose a safety hazard in the hours and days ahead.

"That's unfortunate," someone radioed in Russian.

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'Hard work': Russian spacewalkers swap experiments on space station