China is sharing priceless moon samples with international partners, but NASA can't be a part of it

The Chang'e 5 return capsule at its landing site in Inner Mongolia, China, on Dec. 17, 2020.

Precious moon samples brought back to Earth by China's Chang'e 5 mission in 2020 have finally been shared with international researchers — but the law has made it difficult for U.S.-based scientists to receive any of the material.

Earlier in May, British planetary scientist Mahesh Anand of the Open University in Milton Keynes travelled to China to "borrow" 60 milligrams (0.002 ounces) of the 1,731-gram (3.8 pounds) Chang'e 5 sample. Scientists from elsewhere in Europe, as well as Ethiopia, Russia and the United States, are also receiving samples.