China on Friday broadcast pictures taken by its rover and lander on the moon's far side, in what its space program hailed as another triumph for the groundbreaking mission to the less-understood sector of the lunar surface.
The moon is "tidally locked" to Earth in its rotation so the same side is always facing Earth.
Chinese media revealed that the Yutu took a "nap" after solar radiation raised the temperature on the lunar surface to more than 100 degrees Celsius (212 Fahrenheit) before it rebooted itself on Thursday when the dark side's surface cooled after sunset.More news: Lana Del Ray Releases New Single
He said the Chang'e-4 landed at an altitude of almost minus 6,000 metres.
To overcome the problem, the China National Space Administration launched the Queqiiao relay satellite, last May to assist with the relay exchange between Earth and the Chang'e-4 probe.
The craters close to the rover - including one that was 20 meters wide (65 feet) with a depth of about 4m - will pose great challenges when planning its route, Li said.
Video has been released showing the Chang'e-4 lunar probe, launched in December, making a "soft landing" on the moon at 0226 GMT on January 3.More news: New survey shows Britons would now vote to stay in EU
Yutu-2 is set to rover to the front side of the lander and return an image of the craft, like that taken by its predecessor Yutu for the Chang'e-3 mission above, before continuing to explore using its suite of science instruments. The Chang'e 4 is shown adjusting its altitude, speed and pitch as it seeks to avoid craters and uneven surfaces before it lands.
"The thicker dust shows that the lunar regolith in the region has undergone longer space weathering, which also gives strong evidence of the region being older".
"The far side of the moon has unique features, and has never been explored on site, so Chang'e-4 might bring us breakthrough findings", said Zou Yongliao, director of the lunar and deep space exploration division of the Chinese Academy of Sciences.
It's a monumental achievement for China, which has been playing a bit of "catch up" in space exploration lately.More news: Virgin and Stobart agree to buy Exeter based airline Flybe
The CNSA on Friday released several images taken by the Chang'e-4 probe transmitted back via the relay satellite Queqiao.