Lunar soil brought back by China's moon mission is on display at the Hong Kong Convention and Exhibition Center in Hong Kong, south China, June 25, 2021. The sample was picked up from the moon in December 2020 by the Chang'e-5 lunar probe, the first lunar collection back to Earth in more than 40 years. The probe returned with 1,731 grams of lunar soil. (Xinhua/Li Gang)
