Chang'e 4 (Chinese: 嫦娥四号; pinyin: Cháng'é sìhào) is a planned Chinese lunar exploration mission, to be launched in late 2018, that will incorporate an orbiter, a robotic lander and rover. Chang'e 4 will be China's second lunar lander and rover. It was built as a backup to Chang'e 3, as Chang'e 2 was to Chang'e 1. Following the successful landing of the Chang'e 3 mission, the configuration of Chang'e 4 will be adjusted to meet new scientific objectives. Like its predecessors, the spacecraft is named after Chang'e，the Chinese Moon goddess.
|Mission type||Lander, Lunar rover|
|Mission duration||12 months|
|Launch mass||Orbiter: 425 kg
Lander: 1,200 kg 
Rover: 120 kg
|Start of mission|
|Launch date||Orbiter: June 2018
Lander & rover: late 2018
|Rocket||Long March 4C |
|Landing date||End of 2018|
|Landing site||Crater Von Kármán in
the South Pole-Aitken Basin
Chang'e 4 mission was first scheduled for launch in 2015 as part of the second phase of the Chinese Lunar Exploration Program but the adjusted objectives and design of the mission imposed delays, and it is currently scheduled for launch by the end of 2018. This mission will attempt to determine the age and composition of an unexplored region of the Moon, as well as develop technologies required for the later stages of the program.
Since Chang'e 4 is planned to land on the far side of the Moon, CNSA will first launch a communication relay satellite to Earth–Moon L2 point in June 2018 to relay the signals between the lander/rover and the Earth station. The lander and rover will be launched six months later. It will be the first ever landing on the lunar far side, an unexplored region of the Moon called South Pole-Aitken Basin, a vast basin in the southern hemisphere of the far side which extends from the South Pole to Aitken crater.
The Chinese Lunar Exploration Program has started to incorporate private investment from individuals and enterprises for the first time, a move aimed at accelerating aerospace innovation, cutting production costs, and promoting military-civilian relationships. After Chang'e 4, China will follow with a series of other robotic lunar missions that will build towards an attempted human landing in about 15 years.
The proposed landing site is the Von Kármán crater (180 km diameter) in the South Pole-Aitken Basin on the far side of the Moon. The crater is thought to be the oldest impact feature on the Moon. Regarding its composition, it contains about 10% by weight iron oxide (FeO) and 4-5 parts per million of thorium, which has been used as a replacement for uranium as nuclear fuel on several thorium reactors.
The science objectives include: 
The communications relay satellite, orbiting microsatellites, lander and rover of Chang'e 4 will each carry scientific payloads. The relay satellite will perform radio astronomy , whereas the lander and rover will study the geophysics of the landing zone. These payloads are, in part, supplied by international partners in Sweden, Germany, the Netherlands and Saudi Arabia.
The primary function of the relay satellite, which will be placed in a halo orbit around the Earth-Moon L2 point, is to provide communications between Earth and the lander on the far side of the Moon. Additionally, this satellite will host the Netherlands-China Low-Frequency Explorer (NCLE), an instrument which will perform astrophysical studies in the unexplored radio regime of 80 kHz to 80 MHz from translunar locations.
As part if the Chang'e 4 mission, two microsatellite (45 kg each) unofficially named DSLWP-A1 and DSLWP-A2 will be deployed into lunar orbit to observe the sky at very low frequencies (1 MHz-30 MHz), corresponding to wavelengths of 300 m-10 m, with the aim of studying energetic phenomena from celestial sources.  Due to the Earth's ionosphere, no observations in this frequency range has been done in Earth orbit, offering potential breakthrough science.
The Lander is equipped with the following payloads: