Carrier rocket Long March-5 Y3 is seen at the Wenchang Space Launch Center in south China's Hainan Province, Dec. 21, 2019. The third Long March-5 rocket, China's largest carrier rocket, was vertically transported to the launching area at the Wenchang Space Launch Center in south China's Hainan Province on Saturday. It is planned to be launched at the end of December, according to the China National Space Administration. [Photo/Xinhua]

Carrier rocket Long March-5 Y3 is seen at the Wenchang Space Launch Center in south China's Hainan Province, Dec. 21, 2019. [Photo/Xinhua]

Carrier rocket Long March-5 Y3 is seen at the Wenchang Space Launch Center in south China's Hainan Province, Dec. 21, 2019. [Photo/Xinhua]