Space robots are specialized robots used to replace humans in scientific experiments, extravehicular activities (EVAs), and space exploration. Replacing astronauts with space robots during EVAs can significantly reduce risks and costs.
Space robots operate in a space environment, which is very different from the ground environment. Space robots work in environments with microgravity, high vacuum, ultra-low temperature, strong radiation, and poor lighting. Therefore, the requirements for space robots are necessarily different from those for ground robots, and space robots have their own characteristics.
What are the main tasks of space robots?
1. Spatial Architecture and Assembly
Large installation components, such as radio antennas, solar panels, and the assembly of various modules, rely heavily on space robots for extravehicular activities. Robots will handle tasks such as various material handling operations, connecting and securing components, and dealing with toxic or hazardous materials. In the near future, robots will complete more than half of the initial construction work on the man-made space station.
2. Spacecraft maintenance and repair
As human activities in space continue to develop, humanity's "assets" in space are also increasing, with artificial satellites making up the vast majority. If these satellites malfunction, discarding them and launching new ones is uneconomical; they must be repaired and put back into service. However, sending astronauts to repair them involves extravehicular activities (EVAs), and because spacecraft are exposed to intense cosmic radiation in space, humans are unable to perform these tasks. Therefore, robots are the only option. Space robots perform maintenance and repair work such as recovering malfunctioning satellites, repairing faulty satellites on-site, and resupplying spacecraft.
3. Space production and scientific experiments
Outer space provides humanity with a microgravity and high-vacuum environment unattainable on Earth, allowing for the production of products that are impossible or difficult to manufacture on Earth. Scientific experiments that cannot be conducted on Earth can also be carried out in space. Unlike space assembly and repair, space production and scientific experiments primarily take place within the cabin environment, and the operations are mostly repetitive. In most cases, astronauts can directly inspect and control these processes. Space robots in this context function much like production lines in factories on Earth. Therefore, the robots that can be used are mostly general-purpose, multi-functional robots. Space robots will play a significant role in ensuring the safety of space activities, improving production efficiency and economic benefits, and expanding the role of space stations.
4. A versatile individual in space
It is a space robot operating in space with a certain degree of intelligence, capable of autonomously approaching, circling, rendezvous with, and capturing cooperative and non-cooperative target satellites in space, and can repair, refuel, and dismantle them. In addition to refueling, the space robot can also repair malfunctioning satellites, which greatly reduces the cost of repeated satellite launches.
Furthermore, space robots with autonomous capture capabilities are undoubtedly an offensive weapon. Capturing an enemy satellite and then using weapons or robotic arms to destroy it would be devastating for a defenseless satellite. While some countries have conducted tests on conventional anti-satellite weapons, they can only attack satellites operating in low Earth orbit to a limited extent, which is far from meeting the needs of space warfare.
Space robots can also perform the work of space cleaners. Currently, there is a lot of space debris floating in Earth orbit, traveling at speeds of up to 28,160 kilometers per hour. At such high speeds, even a small piece of paint can damage other satellites, space equipment, spacecraft, and even the International Space Station.
