China visits the far side of the moon

China has landed an uncrewed spacecraft on the far side of the moon, overcoming a key hurdle in its landmark mission to retrieve the world’s first rock and soil samples from the dark lunar hemisphere. The landing elevates China’s space power status in a global rush to the moon, where countries including the United States are hoping to exploit lunar minerals to sustain long-term astronaut missions and moon bases within the next decade.

Reuters reports that the Chang’e-6 craft, equipped with an array of tools and its own launcher, touched down in a gigantic impact crater called the South Pole-Aitken Basin on the moon’s space-facing side on Sunday. The China National Space Administration says the mission “involves many engineering innovations, high risks and great difficulty”.

“The payloads carried by the Chang’e-6 lander will work as planned and carry out scientific exploration missions.”
The successful mission is China’s second on the far side of the moon, a region no other country has reached.
The side of the moon perpetually facing away from the Earth is dotted with deep and dark craters, making communications and robotic landing operations more challenging.

Given these challenges, lunar and space experts involved in the Chang’e-6 mission described the landing phase as a moment where the chance of failure is the highest. “Landing on the far side of the moon is very difficult because you don’t have line-of-sight communications, you’re relying on a lot of links in the chain to control what is going on, or you have to automate what is going on,” said Neil Melville-Kenney, a technical officer at the European Space Agency working with China on one of the Chang’e-6 payloads.

“Automation is very difficult especially at high latitudes because you have long shadows which can be very confusing for landers,” Melville added. The Chang’e-6 probe launched on May 3 on China’s Long March 5 Rocket from the Wenchang Satellite Launch Center on the southern island of Hainan, reaching the lunar vicinity roughly a week later before tightening its orbit in preparation for a landing.

Chang’e-6 marks the world’s third lunar landing this year: Japan’s SLIM lander touched down in January, followed the next month by a lander from U.S. startup Intuitive Machines. The other countries that have sent spacecraft to Earth’s nearest neighbour are the then-Soviet Union and India. The United States is the only country to have landed humans on the moon, starting in 1969.

Using a scoop and drill, the Chang’e-6 lander will aim to collect 2 kg of lunar material over two days and bring it back to Earth. The samples will be transferred to a rocket booster atop the lander, which will launch back into space, tag up with another spacecraft in lunar orbit and return, with a landing in China’s Inner Mongolia region expected around June 25.

If all goes as planned, the mission will provide China with a pristine record of the moon’s 4.5 billion-year history and yield new clues on the solar system’s formation. It will also allow for an unprecedented comparison between the dark, unexplored region with the moon’s better understood Earth-facing side. China plans to send astronauts to the moon in the next decade and then establish a lunar base.

ALSO READ: Chinese astronauts set a new spacewalk record on Tiangong Space Station