On September 10, Russian astronauts Oleg novitskiy and Pyotr Dubrov conducted a spacewalk on Thursday to install debugging equipment for the latest "science" experimental module of the international space station. This is also their second spacewalk in less than a week < p > < / P > < p > the spacewalk began at 10:51 a.m. and ended at 6:16 p.m. Eastern time on Thursday, lasting 7 hours and 25 minutes < p > although the staff of the international space station were awakened by the alarm at about 10 p.m. EDT on Wednesday, the spacewalk was still carried out as planned. It is reported that the sensor detected smoke in the module cabin of the Russian "Star", and the alarm sounded for about a minute. U.S. astronauts also reported that the smell of burning plastic or electronic products entered the U.S. cabin through ventilation < p > the astronauts responded quickly and changed the air filter. All the smoke and smell had dissipated. But the source of the smoke has not been determined < p > this spacewalk is also the second spacewalk conducted by astronauts for the "science" experimental module. The "science" experimental module is a multi-purpose experimental module, including additional research space and sleep area. Russian astronauts plan to carry out 11 spacewalks and complete the configuration of the "science" experimental module < p > in July this year, after the docking of the Russian "science" experimental module, the thruster accidentally ignited, causing the international space station to lose control for a time. At that time, the international space station had three American astronauts, two Russian astronauts, a Japanese astronaut and an astronaut from the European Space Agency < p > Dmitry Rogozin, head of the Russian space agency, said at that time, "we did have a problem," and he attributed the accidental ignition to human error. The "science" experimental module was launched from the Baikonur space launch site in Kazakhstan on July 21 and docked with the international space station on July 29 < p > during the spacewalk on Thursday, Nowitzki and Dubrov installed handrails for the experimental module, completed the unfinished cable wiring during the spacewalk on September 3, and connected the cables and network cables of the experimental module. They took photos during the spacewalk and installed microbial exposure tanks outside the experimental module to study the state of microorganisms in the extreme environment of outer space. In addition, the two safely threw a cable reel cover out of the international space station. During the spacewalk, Nowitzki first went out of the cabin in a red striped Russian spacesuit, followed by Dubrov in a blue striped spacesuit. The spacewalk was the third spacewalk by Dubrov and Nowitzki, and the 243rd spacewalk for the assembly, maintenance and upgrading of the international space station < p > NASA was originally scheduled to conduct a spacewalk on August 24, with NASA astronaut mark Vande hei and NASA astronaut Akihiko xingchu. But the plan was delayed because NASA said van der Hei had "minor health problems" < p > at present, NASA announced that it would carry out the spacewalk on September 12, and van der Hei provided internal support in the module < p > European Space Agency astronaut Thomas pesquet will succeed van der hei and xingchuakiyan to complete the spacewalk. The two will install a retrofit kit on the international space station in preparation for the future installation of solar arrays < p > according to NASA, this will be the first time for two international astronauts to walk out of the "seek" airlock. (Chen Chen) < / P > < p >