Chang'e 6

Chang'e 6 is a robotic lunar exploration mission operated by the China National Space Administration as part of the ambitious Chinese Lunar Exploration Program. Launched on 3 May 2024, its primary goal was to execute the world's first sample return from the far side of the Moon, specifically targeting the South Pole–Aitken basin. The successful mission delivered approximately 1,935.3 grams of lunar material to Earth on 25 June 2024, marking a historic milestone in planetary science and cementing China's status as a leading space power.

Overview

The Chang'e 6 mission is a direct successor to the highly successful Chang'e 5 sample-return mission, which retrieved material from the Moon's near side in 2020. It represents the sixth launch in the Chinese Lunar Exploration Program, a series named after the Chinese mythological moon goddess Chang'e. The mission's complexity was significantly heightened by targeting the lunar far side, which required the deployment of a dedicated relay satellite, Queqiao-2, to facilitate communications with Earth due to the Moon's tidal locking. International collaboration was a feature of the mission, with scientific payloads contributed by France, Italy, Pakistan, and the European Space Agency.

Mission objectives

The core engineering objective of Chang'e 6 was to demonstrate the complete suite of technologies required for automated sampling, ascent from the lunar surface, rendezvous and docking in lunar orbit, and high-speed atmospheric re-entry to return samples to Earth. From a scientific perspective, its paramount goal was to collect and return pristine rock and soil samples from the ancient South Pole–Aitken basin, one of the largest and oldest impact basins in the Solar System. Analyzing these materials aims to provide groundbreaking insights into the early impact history of the Moon, the asymmetry between its near and far sides, and the interior composition and thermal evolution of our celestial neighbor. Secondary objectives included conducting in-situ scientific measurements at the landing site.

Spacecraft design

The Chang'e 6 spacecraft, built by the China Academy of Space Technology, comprised four main modules: an orbiter, a lander, an ascent vehicle, and a return capsule. The mission's design heavily leveraged the proven architecture of Chang'e 5. The lander was equipped with a robotic drill for subsurface sampling and a mechanical arm for scooping surface regolith, storing the collected material in a sealed container within the ascent vehicle. Critical to the mission was the Queqiao-2 relay satellite, launched earlier in 2024, which established a communication link between the far-side lander and ground controllers at the Beijing Aerospace Flight Control Center. The return capsule was designed for a ballistic re-entry and landing in the Siziwang Banner region of Inner Mongolia.

Mission profile

Following its launch from the Wenchang Spacecraft Launch Site atop a Long March 5 rocket, Chang'e 6 entered a trans-lunar injection trajectory. It achieved lunar orbit insertion and, after orbital adjustments, the lander-ascent vehicle composite separated and descended to the surface within the Apollo crater, located inside the South Pole–Aitken basin. After successful sampling operations, the ascent vehicle lifted off from the Moon, performing an automated rendezvous and docking with the waiting orbiter-return capsule in lunar orbit. The sample container was transferred to the return capsule, which then separated for the journey back to Earth. The capsule successfully landed in Mongolia on 25 June 2024, where recovery teams from the China National Space Administration secured the precious cargo.

Scientific payload and results

The lander carried a sophisticated suite of scientific instruments. These included the aforementioned sampling apparatus, a panoramic camera, a lunar mineralogical spectrometer, and a ground-penetrating radar to study subsurface structure. International payloads featured the French Detection of Outgassing RadoN instrument, the Italian laser retro-reflector, and the Pakistani ICUBE-Q cubesat. The primary scientific result is the collection of 1,935.3 grams of far-side lunar material, which includes both surface soil and drilled subsurface samples. Initial analysis suggests the samples are distinct from those returned by Apollo, Luna, and Chang'e 5, potentially containing material ejected from the lunar mantle by the colossal South Pole–Aitken basin impact, offering an unprecedented window into the Moon's deep interior and formative years.

Category:Chinese Lunar Exploration Program Category:2024 in spaceflight Category:Sample return missions Category:Missions to the Moon