BEIJING, June 20 (Xinhua) -- A special lecture began Thursday morning, given by a teacher aboard a space module about 340 km above her students on Earth.
Female astronaut Wang Yaping, one of three crew members aboard the Shenzhou-10 spacecraft, greeted about 330 primary and middle school students at a Beijing high school through a live video feed.
"Hello everyone. I am Wang Yaping. I will host the lecture today," she said, smiling toward a camera onboard the space module Tiangong-1.
Wang and her crew members set off for outer space aboard the Shenzhou-10 spacecraft on June 11. The spacecraft docked with the Tiangong-1 on June 13.
The students she addressed were gathered at the High School Affiliated with Renmin University.
"I was very excited after learning that I could come to this class," said Luo Jiangyuan, a high school freshman who said he plans to study science in college.
"When I learned about the laws of physics and weightless conditions in class, I had to imagine what would happen. But in today's class, I've been able to see what really happens. It is thrilling," he said.
More than 60 million students and teachers at about 80,000 middle schools across the country also watched the live broadcast on TV.
Nie Haisheng, commander of the crew, made a show of putting his legs into a meditation position while floating in the air. Such a show can only be seen in martial arts movies but unable to be achieved by any Kungfu masters in reality on Earth.
"Thanks to the weightless conditions, we are all masters," Wang joked.
Wang showed the students how astronauts measure their weight in the orbiter using a special scale, as normal scales operating under the influence of gravity do not work in outer space.
She also conducted several demonstrations to show how "gravity" works in space, using both fixed and mobile gyros to demonstrate physics concepts.
She demonstrated how zero gravity magnifies the surface tension of water by using a metal ring and a bag filled with water to create a ball of water that was suspended in the air.
"I like all these demonstrations, the gyro and water ball ones particularly. They are all impossible on Earth. How wonderful," said Qian Jianghao, a 10-year-old primary school student.
The students raised a number of questions for the astronauts, asking them how they can tell up from down in space, as well as inquiring about their water recycling system and their view of Earth from the orbiter.
"Through the front windows, we can see Earth and many stars. But we haven't seen any UFOs," Wang said.
The stars in space are brighter, but do not twinkle, she said.
"I tell you a wonderful phenomenon: we can see sunrises 16 times a day, as we circle the Earth every 90 minutes," she said.
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