Story highlights Chinese astronaut Wang Yaping conducts a school lesson from space

The astronaut addressed students through a live link-up from the Chinese space module

Wang fielded questions about space junk, weighing mass in space and UFOs

China has an ambitious space program that includes landing a man on the moon after 2020

In a further sign that China is edging ahead as the world's dominant space power, Wang Yaping -- the second Chinese woman in space -- gave a physics lesson to school children from zero gravity.

Speaking through a video link from the Shenzhou-10 manned spacecraft to a class of middle school students in Beijing, Wang demonstrated the effects of zero gravity on water and a pendulum.

The blue-clad astronaut also showed how she could push a fellow astronaut into the wall of the module with touch of her finger and gulped down the drop of water as it floated in mid-air.

Mass audience

More than 60 million students across China watched the lecture on China's state broadcaster CCTV as Wang demonstrated Newton's second law of motion (force equals mass times acceleration) and the surface tension of water.

Wang fielded questions from students that ranged from whether the team had seen any space junk or even UFOs, to the efficacy of weight scales in space.

Photos: Photos: China launches three into space Photos: Photos: China launches three into space China launches three into space – China's Shenzhou 10 rocket blasts off from the Gobi Desert in the city of Jiuquan, in China's Gansu province, on Tuesday, June 11. The craft is scheduled to dock with the Tiangong-1 space module, where the three crew members will transfer supplies to the space lab, which has been in orbit since September 2011. Hide Caption 1 of 10 Photos: Photos: China launches three into space China launches three into space – Chinese technicians congratulate each other after the Shenzhou-10 rocket successfully launched on June 11. This is expected to be China's longest flight with astronauts on board. Hide Caption 2 of 10 Photos: Photos: China launches three into space China launches three into space – Chinese chief mission commander Zhang Youxia salutes after he announced the successful launch. Hide Caption 3 of 10 Photos: Photos: China launches three into space China launches three into space – The spaceship blasts off on June 11. Hide Caption 4 of 10 Photos: Photos: China launches three into space China launches three into space – Chinese astronaut Wang Yaping, left, mission commander Nie Haisheng and Zhang Xiaoguang wave to onlookers as they prepare to board on June 11. Hide Caption 5 of 10 Photos: Photos: China launches three into space China launches three into space – Yaping, Xiaoguang and Haisheng wave on June 11. Hide Caption 6 of 10 Photos: Photos: China launches three into space China launches three into space – The crew attend a press conference in Jiuquan on Monday, June 10. Hide Caption 7 of 10 Photos: Photos: China launches three into space China launches three into space – Yaping speaks to the media on June 10. Hide Caption 8 of 10 Photos: Photos: China launches three into space China launches three into space – Haisheng trains on May 8. Hide Caption 9 of 10 Photos: Photos: China launches three into space China launches three into space – Xiaoguang, left, Haisheng and Yaping sit in a simulated spaceship capsule on April 29. Hide Caption 10 of 10

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The demonstration drew a spirited response on social media in China, with comments on Weibo -- China's equivalent of Twitter -- ranging from enthusiastic support for the country's space program, to questioning the cost of the Shenzhou-10 program.

"The U.S. used to be proud of their space class, (but) now we've made it, too!" one user posted. "We should be proud of this. What others have, we have it too."

Experimental space station

China launched three astronauts into space on board the Shenzhou-10 craft last week to dock with Tiangong-1, an experimental space station used to test orbital rendezvous and docking capabilities.

It is China's fifth manned mission to space in a decade.

While the space station only has a two-year operational lifespan, the development of a permanent space station is part of Beijing's ambitious multi-billion dollar space plan, which is being hailed by the Communist Party as a symbol of China's growing technical expertise.

China first sent a human into space in 2003 but is already planning to complete its space station by 2020, and sometime afterwards land a man on the moon. Despite the ambitious space program, China still lags Russia and the U.S. and is still attempting to reach milestones achieved by the two superpowers decades ago.

Playing catch-up

Despite these limitations, China's Tiangong-1 space station is half the size of the first space station, Salyut 1, that the Soviets sent up in 1971 -- analysts say that China is able to take advantage of advances in spaceflight technology.

"What we have seen more than anything else is a truly long-term commitment to space that dates back at least 25 years, and a sustained interest during those 25 years," Dean Cheng of the Heritage Foundation, a policy research group in Washington DC, told the New Scientist

He said NASA's human spaceflight program has struggled under changing budgets and governments while the Chinese space program had seen ordered and incremental progress since the 1990s.

"So as long as the money holds out and political stability reigns, they might well get to some place like Mars or establish a lunar presence, precisely because they are persistent and willing to spend the money and make the effort," he said.