Den 08.12.2018 08.39, skrev Jan Panteltje:
China launches Chang'e-4 probe to shed light on moon's dark side
http://chinaplus.cri.cn/news/china/9...08/220199.html

Data will be relayed by relay satellite "Queqiao" in a halo orbit at the
Lagrangian (L2) point of the earth-moon system, about 455,000 km from the earth.


What is the Moon's "dark side"?

--
Paul

https://paulba.no/