 Rule changes this year, among other things, allow the moderators to mute both mics in a bid to help avoid that. Sagar Magani, Washington. China's space officials said today 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 from the far side of the moon, but noted there were limits to that cooperation, specifically with the U.S.,