Extravehicular activity (EVA) is also known as a spacewalk. Taikonauts Nie Haisheng, Liu Boming and Tang Hongbo have been living and working in the core module of China's space station for over two months. 

What work did they perform during their second spacewalk this Friday? What are the major challenges during the spacewalk? How important is this EVA to the space station construction and further exploration? Join CGTN's Wu Lei to discuss the spacewalk with Xu Yansong, director-general of Asia-Pacific Space Cooperation Organization and Bernard Foing, director of ILEWG EuroMoonMars and chair of IAF ITACCUS Committee to find out more!