The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020. The return capsule of China's Chang'e-5 probe touched down on Earth in the early hours of Thursday, bringing back the country's first samples collected from the moon, as well as the world's freshest lunar samples in over 40 years. (Photos: Xinhua)

The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members work at the landing site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members pose for a group photo at the landing site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, Dec. 17, 2020.

Staff members work at the landing site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members work at the landing site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Photo taken on Dec. 17, 2020 shows the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region.

The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members work at the landing site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Photo taken on Dec. 17, 2020 shows the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region.

Photo taken on Dec. 17, 2020 shows the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region.

The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members work at the landing site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members work at the landing site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

The return capsule of China's Chang'e-5 probe lands in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Photo taken on Dec. 17, 2020 shows the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region.

Technical personnel monitor the landing of the return capsule of China's Chang'e-5 probe at Beijing Aerospace Control Center in Beijing, capital of China, Dec. 17, 2020.

Screen image captured at Beijing Aerospace Control Center in Beijing, capital of China, Dec. 17, 2020 shows staff members searching for the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region.

Technical personnel shake hands to celebrate the landing of the return capsule of China's Chang'e-5 probe at Beijing Aerospace Control Center in Beijing, capital of China, Dec. 17, 2020.

Screen image captured at Beijing Aerospace Control Center in Beijing, capital of China, Dec. 17, 2020 shows staff members searching for the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region.

This simulated image captured at Beijing Aerospace Control Center in Beijing, capital of China, Dec. 17, 2020 shows the landing of the return capsule of China's Chang'e-5 probe.

Staff members transport the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members transport the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members transport the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Aerial photo taken on Dec. 17, 2020 shows the retrieval site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region.

A staff member works at the landing site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members work at the landing site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members load the return capsule of China's Chang'e-5 probe to a truck in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members transport the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members load the return capsule of China's Chang'e-5 probe to a truck in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Photo taken on Dec. 17, 2020 shows the retrieval site of the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region.

Staff members transport the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members load the return capsule of China's Chang'e-5 probe to a truck in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members transport the return capsule of China's Chang'e-5 probe in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.

Staff members load the return capsule of China's Chang'e-5 probe to a truck in Siziwang Banner, north China's Inner Mongolia Autonomous Region, on Dec. 17, 2020.