“Chang'e-4 will be humanity's first landed exploration of the lunar far side. The challenge faced by a far side mission is communications. With no view of Earth, there is no way to establish a direct radio link. So a relay satellite named Queqiao was launched to the LaGrange Point between Earth and the Moon in May 2018 to orbit 40,000 miles (65,000 km) from the lunar surface and can communicate with ground stations in China.” - Dr Long Xiao, China University of Geosciences, Wuhan, China
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