China’s Tianwen-1 orbiter has successfully photographed the interstellar object 3I/ATLAS as it traveled through the inner solar system near Mars. The spacecraft, which has been orbiting Mars for four years and eight months, captured the images using its high-resolution camera from a distance of about 30 million kilometers. This observation makes Tianwen-1 one of the closest spacecraft to study the comet since its discovery in May 2025.
The imagery obtained by Tianwen-1’s High-Resolution Imaging Camera revealed several characteristics consistent with cometary activity. The photographs show a visible tail extending from the object and a surrounding coma composed of gas and dust. By combining multiple images into an animation, researchers tracked the comet’s trajectory as it moved toward its closest approach to the Sun. The observations provide additional confirmation that 3I/ATLAS contains water and other volatile materials that have been vaporizing as the object warmed during its transit through the solar system.
Capturing clear images of 3I/ATLAS presented significant technical challenges. The comet measures approximately 5.6 kilometers in diameter and travels at considerable speed—around 58 kilometers per second, with its velocity relative to Tianwen-1 reaching approximately 86 kilometers per second. The camera system itself was originally designed to observe bright features on the Martian surface rather than faint distant objects. The Tianwen-1 team conducted extensive preparation beginning in early September, including simulations and theoretical modeling to successfully execute the observation.
Other spacecraft orbiting Mars also detected 3I/ATLAS around the same timeframe. On October 3rd, both the European Space Agency’s Mars Express and ExoMars Trace Gas Orbiter captured images of the comet using their respective imaging systems. The extreme difficulty in detecting 3I/ATLAS highlighted its faintness—the object appeared roughly 10,000 to 100,000 times dimmer than sunlit Martian surface features.
The successful observation of this interstellar visitor carries scientific significance for understanding other planetary systems. As preserved material from the formation of distant star systems, interstellar objects like 3I/ATLAS provide rare opportunities to gather information about conditions around other stars that would be otherwise impossible to obtain through conventional telescopic observations. The European Space Agency’s Comet Interceptor mission, expected to be operational by 2029, represents one planned effort to study such visitors at close range in the future.
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