In a historic first, China has landed a rover on the far side of the moon, state media announced Thursday, a huge milestone for the nation as it attempts to position itself as a leading space power.
China's National Space Administration landed the rover at 10:26 a.m. Beijing time in the South Pole-Aitken Basin, the moon's largest and oldest impact crater, China Central Television reported.
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It made its final descent from an elliptical orbit 15 kilometers (9.3 miles) above the moon's surface, making a "smooth" and "precise" landing, according to the general designer of the probe Chang'e 4, Sun Zezhou, who added that the spacecraft pulled off a "bull's-eye."
State media reported that the rover, which China has named Yutu-2, or Jade Rabbit-2, transmitted back the world's first close-range image of the far side of the moon. The rover was named in a global poll in August. In Chinese foklore, Yutu is the white pet rabbit of Chang'e, the moon goddess after which the Chinese lunar mission is named, state media Xinhua reported.
Several hours after touchdown, the rover separated from the lander on the moon's surface and began its mission.
The far side of the moon is the hemisphere that never faces Earth, due to the moon's rotation. It is sometimes mistakenly referred to as the "dark side of the moon," even though it receives just as much sunlight as its Earth-facing side.
The success of the mission represents a landmark in human space exploration. The area where the probe has landed faces away from Earth, meaning it is free from radio frequencies. As a result, it is not possible for a lunar rover to communicate directly with ground control. To overcome this hurdle, China launched a dedicated satellite orbiting the moon last year that will be able to relay information from the rover to Earth.
"China is on the road to become a strong space nation. And this marks one of the milestone events of building a strong space nation," chief designer for the lunar mission, Wu Weiren, told China Central Television.
It is hoped the lander will conduct a number of tasks, including conducting the first lunar low-frequency radio astronomy experiment, observe whether plants will grow in the low-gravity environment, and explore whether there is water or other resources at the poles.
Another function of the mission is to study the interaction between solar winds and the moon surface using a new rover.
"Since the far side of the moon is shielded from electromagnetic interference from the Earth, it's an ideal place to research the space environment and solar bursts, and the probe can 'listen' to the deeper reaches of the cosmos," said Tongjie Liu, deputy director of the Lunar Exploration and Space Program Center for the China National Space Administration.
The Chang'e 4 rover is 1.5 meters (5 feet) long and about 1 meter (3.3 feet) wide and tall, with two foldable solar panels and six wheels.
"China is anxious to get into the record books with its space achievements," said Joan Johnson-Freese, a professor at the US Naval War College and an expert on China's space program.
"It is highly likely that with the success of Chang'e -- and the concurrent success of the human spaceflight Shenzhou program -- the two programs will eventually be combined toward a Chinese human spaceflight program to the moon," she added. "Odds of the next voice transmission from the moon being in Mandarin are high."
Thursday's official televised announcement that the probe had landed came approximately an hour after state media outlets China Daily and China Global Television Network deleted posts on social media proclaiming the mission a success, sparking widespread confusion as to whether the probe had made touchdown.
No explanation was given as to why the tweets were deleted. On social media, observers speculated as to the cause of the apparent backtracking, with many wondering whether the mission had experienced a temporary upset or whether it was a simple case of state media jumping the gun ahead of the official announcement.
China's last lunar rover -- named Yutu, or Jade Rabbit -- ceased operation in August 2016 after 972 days of service on the moon's surface as part of the Chang'e 3 mission. China was only the third nation to carry out a lunar landing, after the United States and Russia.
The overall design of the new rover is inherited from Jade Rabbit, according to the chief designer of China's lunar probe program.
"We worked hard to improve its reliability, conducting thousands of experiments to ensure its long-term operation, especially taking into consideration rocks, ravines and frictions on the Moon," Wu Weiren told state broadcaster China Central Television in August.
Beijing plans to launch its first Mars probe around 2020 to carry out orbital and rover exploration, followed by a mission that would include collection of surface samples from the Red Planet.
China also is aiming to have a fully operational permanent space station by 2022, as the future of the International Space Station remains in doubt due to uncertain funding and complicated politics.
In comparison, despite its recent success in sending a robotic lander to Mars, the US space agency NASA has faced years of budgetary constraints.
Although the Chinese government has long stressed its "peaceful motives" in space exploration, Washington increasingly views China -- along with Russia -- as a potential threat, accusing Beijing of working to bring new weapons into space and prompting President Donald Trump to announce the establishment of a US Space Force by 2020.
The US Congress has barred NASA from working with China due to national security concerns.
"A high percentage of space technology is (civilian-military) dual use," Johnson-Freese said. "The US sees pretty much everything China does in space -- including things the US has done in space -- as threatening."
She suggested that combining military preparedness with diplomatic efforts would best deter perceived threats in space from all sides but added that "unfortunately, the US has not shown interest in diplomatic leadership regarding space security."
This story has been updated to clarify the sequence in which images of the moon were taken by Chang'e 4.
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