China’s Tianwen-1 probe sent unprecedented images of the interstellar comet 3I/ATLAS, captured directly from Mars orbit. The photographs, released by the China National Space Administration (CNSA), show the comet in motion, with its nucleus and coma visible. The feat occurred in July 2025, when the object passed close to the Sun, temporarily out of reach of terrestrial telescopes. The mission highlights China’s technological advancement in space exploration.
Comet 3I/ATLAS, identified on July 1, 2025 by the ATLAS system, is the third confirmed interstellar object, after 1I/ʻOumuamua and 2I/Borisov. Its speed of 58 km/s and peculiar chemical composition aroused global scientific interest. The images from Tianwen-1, originally designed to photograph the Martian surface, were obtained after precise technical adjustments.
- The comet has a rocky and icy core, surrounded by a coma of gas and dust.
- Its trajectory was slightly altered, suggesting mass loss due to degassing.
- The Tianwen-1 mission maximized the use of its high-resolution camera.
Astronomers are now analyzing the data to better understand the origin and behavior of the comet after it passes the Sun.
Technology behind the images
Capturing the images required complex simulations by the CNSA team. Tianwen-1’s high-resolution camera, designed for bright targets on the surface of Mars, has been adapted to record an object 10,000 to 100,000 times dimmer.uro.
The adjustments involved precise calculations of the comet’s orbit and available lighting. The CNSA highlighted that the mission’s success reflects advances in Chinese space engineering.
Comet 3I/ATLAS Details
The interstellar comet 3I/ATLAS is a cosmic relic, possibly 10 billion years old. It has a rare tail and an unusual chemical composition, intriguing scientists.
Its passage through the Sun revealed changes in its trajectory, indicating degassing.
The coma of the comet, thousands of kilometers across, was clearly recorded.
Researchers are now studying these features to map their interstellar origin.
Scientific relevance of the discovery
The observation of 3I/ATLAS by a Martian probe is a milestone in astronomy. Interstellar comets offer clues about the formation of other stellar systems. Tianwen-1, in orbit since February 2021, complements data from missions such as ESA’s Mars Express.
The images allow us to study the impact of the interstellar medium on comet objectsrivers.
The data collected will help understand the comet’s interaction with the Sun.
Ground-based telescopes resumed observations after the comet reappeared.
ESA’s JUICE probe may soon provide new images.
Collaborative Mission Effort
The success of Tianwen-1 involved collaboration between engineers and scientists. The mission required detailed planning to align the probe with the comet’s trajectory. CNSA highlighted innovation in adapting equipment to distant targets.
Impact for global astronomy
Comet 3I/ATLAS is a rare opportunity to study objects from outside the Solar System. Its composition can reveal conditions in distant regions of the universe. The scientific community awaits more data to confirm theories about its formation. Tianwen-1 images reinforce the importance of orbital missions for cosmic observations.
Future notes
With the comet now visible again from Earth, global telescopes intensify analyses. The possible mass loss of 3I/ATLAS suggests intense activity during its solar approach. The JUICE probe, on its way to Jupiter, can capture new images, expanding the study. CNSA plans to continue analyzes to detail the comet’s structure.
