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On a largely black background, interstellar comet 3I/ATLAS appears as a white smudge with a semicircular shape at its core. A transparent white cloud extends slightly from the comet toward the bottom left of the image and, to a lesser extent, toward the right side of the image

MRO HiRISE images 3I/ATLAS

The High Resolution Imaging Science Experiment (HiRISE) camera aboard NASA’s Mars Reconnaissance Orbiter captured this image of interstellar comet 3I/ATLAS on Oct. 2, 2025. At the time it was imaged, the comet was about 0.2 astronomical units (19 million miles, or 30 million kilometers) from the spacecraft.

Image Credit: NASA/JPL-Caltech/University of Arizona
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Image CreditNASA/JPL-Caltech/University of Arizona
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