China's Chang'e-4 space probe is in position to make the first-ever soft landing on the dark side of the moon.
A Chinese space probe is moving into position to land on the dark side of the moon for the first time, the official Xinhua news agency says, a mission seen as an important step as the country looks to push forward its space programme.
The probe, the Chang'e-4, entered a planned orbit on Sunday "to prepare for the first-ever soft landing on the far side of the moon", the news agency said on Sunday, citing the China National Space Administration.
It didn't say when the landing would occur.
The moon is tidally locked to Earth, rotating at the same rate that it orbits our planet, so the far side - or the "dark side" - is never visible from Earth. Previous spacecraft have seen the far side of the moon, but none has landed on it.
China launched the Chang'e-4 probe earlier this month, carried by a Long March-3B rocket. It includes a lander and a rover to explore the surface of the moon.
Xinhua said that the probe had entered an elliptical lunar orbit at 8.55 am Beijing time (11.55am AEDT), which brought it at its closest point just 15 kilometres away from the surface of the moon. The Chang'e-4 first entered a lunar orbit on December 12.
The tasks of the Chang'e-4 include astronomical observation, surveying the moon's terrain, landform and mineral composition, and measuring the neutron radiation and neutral atoms to study the environment on the far side of the moon.
China aims to catch up with Russia and the United States to become a major space power by 2030. It is planning to launch construction of its own manned space station next year.
However, while China has insisted its ambitions are purely peaceful, the US Defense Department has accused it of pursuing activities aimed at preventing other nations from using space-based assets during a crisis.
The space control centre will select a "proper time" to land the probe on the far side of the moon, Xinhua reported. Its descent is being aided by a relay satellite, the Queqiao, or Magpie Bridge.