China science, technology news summary -- Dec. 18

BEIJING, Dec. 18 (Xinhua) -- The following is a summary of published science and technology news of China.

SPACE TRACKING SHIP

China's tracking ship Yuanwang-3 departed from a port on Sunday for new spacecraft monitoring missions.

The crew members will spend the New Year holiday and Spring Festival during this voyage. This year, the ship has spent more than 120 days at sea, sailing over 33,000 naut