This simulated image captured at Beijing Aerospace Control Center in Beijing, capital of China, Dec. 17, 2020 shows the return capsule of China's Chang'e-5 probe landing in Siziwang Banner, north China's Inner Mongolia Autonomous Region. 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. (Xinhua/Jin Liwang)

This simulated image captured at Beijing Aerospace Control Center in Beijing, capital of China, Dec. 17, 2020 shows the return capsule of China's Chang'e-5 probe landing in Siziwang Banner, north China's Inner Mongolia Autonomous Region. 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. (Xinhua/Jin Liwang)

Technical personnel 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. 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. (Xinhua/Yue Yuewei)

Technical personnel 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. 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. (Xinhua/Yue Yuewei)

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. 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. (Xinhua/Yue Yuewei)

Technical personnel work at Beijing Aerospace Control Center in Beijing, capital of China, 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. (Xinhua/Zhang Ling)

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. 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. (Xinhua/Jin Liwang)

Technical personnel work at Beijing Aerospace Control Center in Beijing, capital of China, 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. (Xinhua/Jin Liwang)

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. 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. (Xinhua/Jin Liwang)

Technical personnel work at Beijing Aerospace Control Center in Beijing, capital of China, 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. (Xinhua/Jin Liwang)

Technical personnel work at Beijing Aerospace Control Center in Beijing, capital of China, 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. (Xinhua/Jin Liwang)

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. (Xinhua/Lian Zhen)

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. (Xinhua/Lian Zhen)

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. (Xinhua/Lian Zhen)

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. (Xinhua/Peng Yuan)

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. (Xinhua/Ren Junchuan)

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. (Xinhua/Peng Yuan)

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. (Xinhua/Ren Junchuan)

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 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. (Xinhua/Lian Zhen)

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. 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. (Xinhua/Lian Zhen)

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 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. (Xinhua/Lian Zhen)

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 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. (Xinhua/Lian Zhen)

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 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. (Xinhua/Peng Yuan)

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. (Xinhua/Ren Junchuan)

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 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. (Xinhua/Ren Junchuan)

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 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. (Xinhua/Lian Zhen)

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 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. (Xinhua/Peng Yuan)

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. (Xinhua/Ren Junchuan)

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 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. (Xinhua/Ren Junchuan)

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 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. (Xinhua/Ren Junchuan)

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. (Xinhua/Ren Junchuan)

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. (Xinhua/Lian Zhen)

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 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. (Xinhua/Peng Yuan)