Roscosmos cosmonaut Sergey Prokopyev is pictured laying cable on the Zvezda service module during a spacewalk on Aug. 15, 2018, when he was an Expedition 56 Flight Engineer. Now, as Expedition 68 Commander he will go on his fourth career spacewalk with Roscosmos Flight Engineer Dmitri Petelin, who is going on his second career spacewalk, at 9:20 p.m. EST on Wednesday, Dec. 14, to transfer a radiator from the Rassvet module then connect it to the Nauka multipurpose laboratory module. #roscosmos #cosmonaut #spacewalk #walk #radiator #rassvet #nauka #zvezda #international #space #station