China's Moon Porter for Chang'e-8: A 4-Wheeled Robot with Two Arms
A New Era of Lunar Exploration
China is set to launch a groundbreaking lunar rover that combines advanced robotics with artificial intelligence (AI) to support the Chang'e-8 mission, scheduled for 2029. This robot, developed by a team led by the Hong Kong University of Science and Technology (HKUST), features a humanoid upper body and four wheels, making it a unique addition to the world of space exploration.
The 100kg (220lbs) robot is designed to act as an AI-powered porter for the Chang'e-8 mission. Its primary role will be to transport, deploy, and install instruments and sensors at designated locations on the moon's south pole after the Chang'e-8 probe lands. It will also collect samples of the moon's surface, contributing valuable data to scientific research.
Professor Gao Yang, who leads the Hong Kong Space Robotics and Energy Centre, shared insights about the project. She mentioned that while the Chang'e-7 mission might witness the first humanoid robot landing on the moon's south pole, their robot will explore a different part of this vast region. "We are curious about all of it," she said.
This mission represents a novel demonstration of humanoid robotics on the moon, and Gao expressed pride in the design. The robot was developed in collaboration with 30 universities and space organizations across Hong Kong, mainland China, and overseas.
One of the challenges faced by the team was coordinating the robot's two arms to perform complex tasks. The robot must pick up and place scientific instruments provided by other mission partners, which may not be designed for interaction with the robot. However, the AI system enables the robot to identify and trace objects, allowing it to formulate strategies before executing tasks. Additionally, the robot will handle ad hoc tasks such as dealing with space debris.
The AI will also assist the robot in navigating the moon's rugged terrain, including dark impact craters and perpetually sunlit ridges. Functions like remote vision processing and 3D mapping will ensure safe navigation through these challenging environments.
The HKUST team worked closely with the Shanghai Academy of Spaceflight Technology to enhance the robot's mobility. Unlike most planetary rovers that use six wheels, this robot has four, enabling it to climb over obstacles higher than twice the wheels' radius. Gao described this four-wheel capability as "extraordinary" and noted that it allows for precise steering of the wheels.
The solar-powered robot is built to operate for two years, enduring at least 24 lunar nights. Each night lasts over 330 hours and is extremely cold due to the lack of an atmosphere. To withstand the extreme temperature range of 120 degrees to minus 180 degrees Celsius (248 to minus 292 Fahrenheit), the robot features a thermal management system using circulating fluid and advanced materials to protect its core components.
Gao mentioned that the robot is currently undergoing integration tests with the lunar lander, where it will be folded and mounted before deployment. She highlighted the challenges of developing spacecraft, noting the need to balance performance with miniaturization and energy efficiency while ensuring safety.
The Chang'e-8 mission aims to explore Mons Mouton, a flat-topped mountain on the moon. It will collaborate with the Chang'e-7 mission, scheduled to leave Earth in August, to explore and conduct experiments using local resources. This collaboration lays the groundwork for a future Sino-Russian International Lunar Research Station.
The mission's payload will include elements from around the world, such as a lunar rover developed by Pakistan and the International Society for Terrain-Vehicle Systems, an exploration rover from Turkey, and radio astronomical instruments by South Africa and Peru. Additional payloads include laser retroreflector arrays from Italy, a Russian plasma and dust analyser, a high-energy particle detector, a Thai neutron analyser, a lunar surface imaging system developed by Bahrain and Egypt, and a monitor from Iran.
