Bian Zhigang, Deputy Director of the China National Space Administration speaks during a press conference at the State Council Information Office in Beijing, Thursday, June 27, 2024. China's space officials said Thursday they welcomed scientists from across the world to apply to study the lunar rock samples the Chang'e 6 probe brought back to earth in a historic mission, but noted there were limits to that cooperation, specifically with the U.S. (AP Photo/Andy Wong)