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#China The nation's robotic Chang'e 6 mission returned material from the moon's mysterious far side to Earth on Tuesday (June 25) — something that had never been done before. The far side, which is very different from the near, is more difficult to explore. Because the far side faces away from Earth, a relay satellite is required to communicate with spacecraft that operate there. (China has launched two such relay satellites to date.)
https://www.space.com/china-chang-e-6-moon-far-side-samples-landing-earth