Students wait for the beginning of the space lecture at the ground classroom set at the High School Affiliated to Renmin University of China, in Beijing, capital of China, June 20, 2013. A special lecture will begin at about 10:00 a.m. Beijing time Thursday morning, given by a teacher aboard China's space module Tiangong-1 to students on Earth. (Xinhua/Wang Yongzhuo)

Students wait for the beginning of the space lecture at the ground classroom set at the High School Affiliated to Renmin University of China, in Beijing, capital of China, June 20, 2013. A special lecture will begin at about 10:00 a.m. Beijing time Thursday morning, given by a teacher aboard China's space module Tiangong-1 to students on Earth. (Xinhua/Li Xin)

People prepare for the space lecture at the ground classroom set at the High School Affiliated to Renmin University of China, in Beijing, capital of China, June 20, 2013. A special lecture will begin at about 10:00 a.m. Beijing time Thursday morning, given by a teacher aboard China's space module Tiangong-1 to students on Earth. (Xinhua/Li Xin)

A journalist prepares for the space lecture at the ground classroom set at the High School Affiliated to Renmin University of China, in Beijing, capital of China, June 20, 2013. A special lecture will begin at about 10:00 a.m. Beijing time Thursday morning, given by a teacher aboard China's space module Tiangong-1 to students on Earth. (Xinhua/Li Xin)

Teachers and students wait for the beginning of the space lecture at the ground classroom set at the High School Affiliated to Renmin University of China, in Beijing, capital of China, June 20, 2013. A special lecture will begin at about 10:00 a.m. Beijing time Thursday morning, given by a teacher aboard China's space module Tiangong-1 to students on Earth. (Xinhua/Li Xin)