Chinese astronauts conducted a science lecture 400 kilometers above Earth to millions of students on Thursday afternoon,as they orbited in the Tiangong space station.All members of the Shenzhou XII mission crew,Zhai Zhigang,Ye Guangfu and Wang Yaping,the only woman on the mission,greeted students,teachers and other participants when the lecture started at 3:54 pm.They showed viewers how they live and work inside the space station,which currently consists of a core module,a spacecraft and two robotic cargo spaceships.

The astronauts displayed their exercise equipment and a specially designed space suit,and conducted demonstrations on physical phenomena in microgravity,such as“disappearing buoyancy”and a“water ball”.Ye,who is on his first spaceflight,showed how he rotated his body in the weightless environment.The astronauts also answered questions from students during the lecture.

Tens of millions of primary and middle school students across China watched the hour-long televised event.A total of 1,420 invited students were present at“ground class venues”,with some taking part in video chats with the crew members during the lecture.

It was the first lecture of the Tiangong Class,or Heavenly Palace Class,China’s first extraterrestrial(地球外的)lecture series to popularize space science.

More lectures will be held based on the country’s manned spaceflights and will also be presented by Chinese astronauts,the manned space agency said.

Shi Yi,a physics teacher at the Beijing No.101 Middle School,said the space lecture was an eye-opening experience that would ignite students’interest in science.

Wang Yihan,a fifth-grade student at the Yuxin School,said:“The astronauts’experiments really intrigued and surprised me.I have great interest in spaceflight and would like to take part in our country’s space exploration program in the future.”

Vincent Wong Wai-shing,deputy principal of Hong Kong’s Pui Kiu College,said after watching the lecture that the event gave Hong Kong students an opportunity to communicate with the astronauts while stimulating their interest in space and science