A special lecture on the properties of gravity was given to a group of Beijing students by astronauts onboard China's first experimental space lab orbiting about 340 km above earth on Thursday, state media reported.<br/> <br />The three astronauts were sent to space on the Shenzhen 10 spacecraft for a 15-day mission on June 11, and docked with the space module Tiangong (Heavenly Palace) 1 on June 13.<br/> <br />Via a live video link also broadcast live by China's state television CCTV, astronauts conducted various physics experiments in a weightless environment in front of around 330 students in Beijing.<br/> <br />Female astronaut Wang Yaping demonstrated how zero gravity affects various objects, using a pendulum and a water bubble.
