Russian cosmonauts, Dmitri Petelin and Sergey Prokopyev, have completed their third spacewalk since April at the International Space Station (ISS). The five-hour spacewalk involved activating a radiator attached to the Nauka Science Module during an April 19 spacewalk. Prior to the spacewalk, the cosmonauts spent the day readying their Orlan spacesuits in the Station’s Poisk airlock, where they attached batteries, checked for leaks and tested the suits’ communications systems. The Orlan spacesuits used by Petelin and Prokopyev are an evolution of spacesuits that were intended for the scrapped Soviet moon program but have been upgraded over the decades, eventually for use on the ISS. Cosmonaut Andrey Fedyaev, who assisted Petelin and Prokopyev on previous spacewalks, conducted two experiments on Wednesday, attaching a sensor to monitor his blood pressure and a piece of headgear designed to monitor his reactions to simulated spacecraft and robotic arm operation.
