Beijing, November 13 (Youth.cn) - Photo taken at the site of the 15th Airshow China on November 12th. Lunar soil samples brought back by Chang'e-6 are being shown on the Airshow, which is its first public exhibition. The returner, the national flag and the steel material of the Chang'e-6 are also being exhibited. Chang'e-6 brought back 1935.3g lunar soil sample. Primary research shows that basalt brought back by Chang'e-6 was from three historical period, respectively from 2.8 billion years ago, 3.9 billion years ago and 4.2 billion years ago. It is of great scientific research value. Photo/VCG