The stars themselves may become a navigation system for vehicles heading to distant planets, after Chinese researchers tested a method that allows a vehicle to estimate its position and movement without constantly relying on ground tracking stations.
In an experiment conducted in January 2026, the Chinese satellite Tianhui-7 used this method in a low Earth orbit and, according to the researchers, was able to determine its position with an accuracy of approximately 5 kilometers, a result described as being similar in level of accuracy to what NASA’s Deep Space Network provides in some tracking applications.
How can the stars determine the movement of the spacecraft?
The idea is based on a physical phenomenon known as stellar aberration, which is a very small change in the apparent position of stars seen by a moving observer compared to a stationary observer.
Because the spacecraft is moving at high speed, its onboard instruments detect slight shifts in the orientation of stars, depending on the spacecraft's speed and direction of travel. By measuring these angular changes between stars, navigation systems can infer information about the spacecraft's speed and movement, and then use this information to determine its position.
The goal was to develop a method that vehicles could use far from Earth, where ground communications and tracking become more difficult.
From Earth to Jupiter... Why does the vehicle need independence?
The importance of this technology lies in the fact that controlling a spacecraft from the ground becomes increasingly complex as it travels farther away. At great distances, engineers cannot simply send a command, wait for the result, and then immediately correct the course; the signal itself takes tens of minutes to arrive, and the response takes roughly the same amount of time.
Therefore, autonomous navigation can give the spacecraft greater ability to calculate its position and direction and make some course-related decisions from within, which is especially important when approaching Jupiter or performing orbital maneuvers.
The results of the Tianhui-7 experiment suggest the practicality of this concept, but they don't mean the technology is ready for a Jupiter mission. The experiment was conducted in low Earth orbit, not deep space, so the method will require further testing in different environments and conditions before it can be relied upon for interplanetary travel.
This step comes as part of a broader trend towards developing vehicles that can navigate and operate more independently, whether on missions to Jupiter and its moons or to regions beyond the solar system.
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