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Now there are two flags flying on the Moon, one from the U.S. put there during the Apollo mission, and now, on the far side of the Moon, China has placed its own flag. The flag will remain there for some time as it is made out of basalt rock. Professor Zhou Changyi from the National Space Science Center of the Chinese Academy of Sciences, explains. “We crushed and melted the rocks in order to pull them into thin threads with a diameter about one-third that of a hair,” he told CGTN. He said that the flag could last over 10 millennia on the Moon as it is highly resistant to corrosion, heat and cold.

The Moon contains a good deal of basalt rock. Zhou also noted that the material could also be used to build China’s lunar research base in the future.