China has successfully landed a spacecraft on the far side of the moon. The spaceship, Chang’e-4, is the first in the world to accomplish this feat. It touched down at 10:26 am local time on January 3, 2019, in the Von Kármán crater in the South Pole-Aitken Basin. One of the challenges to getting there was that direct communications with spacecraft are blocked by the moon itself. So in May 2018, China launched a communications relay satellite called Queqiao into a loop 65,000 kilometers beyond the moon at a gravitationally balanced location from which the spacecraft can exchange signals with both Earth and the moon’s far side. You can find more information and images here.