Get ready to be amazed—NASA has just unveiled breathtaking new images of comet 3I/ATLAS, captured from the perspective of Mars, offering some of the most intimate views of this interstellar wanderer to date. But here’s where it gets mind-blowing: this comet isn’t from our solar system. It’s a visitor from another star system, passing through our cosmic neighborhood before vanishing into the depths of space forever. And this is the part most people miss—while it’s here, scientists are racing to study its shape, size, chemical makeup, and trajectory using our most advanced telescopes and spacecraft.
In October 2025, three of NASA’s Mars missions teamed up to capture this elusive comet. The Mars Reconnaissance Orbiter (MRO) snapped a close-up, the MAVEN spacecraft imaged it in ultraviolet light, and even the Perseverance rover on the Martian surface managed to catch a glimpse. What makes this even more remarkable is that these images were taken while 3I/ATLAS was hidden behind the Sun from Earth’s perspective, giving scientists a rare opportunity to observe it during an otherwise invisible phase.
Here’s the controversial part: While most comets we see are born within our solar system, 3I/ATLAS is an outsider, formed in a distant star system. This raises fascinating questions about its origins and what it can teach us about the universe beyond our cosmic backyard. Could it carry clues about the chemistry of other star systems? Or perhaps it challenges our understanding of how comets form and travel across galaxies. Let’s dive deeper.
MAVEN, short for Mars Atmosphere and Volatile Evolution, observed 3I/ATLAS over 10 days starting September 27, 2025, using its Imaging Ultraviolet Spectrograph (IUVS). This instrument captured the comet in multiple wavelengths, revealing high-resolution ultraviolet images that confirmed the presence of hydrogen. These findings, detailed in our report (https://www.skyatnightmagazine.com/news/comet-3i-atlas-nasa-maven-hydrogen), offer a glimpse into the comet’s composition.
Meanwhile, the Mars Reconnaissance Orbiter used its HiRISE camera—typically designed to study Mars’ surface—to capture 3I/ATLAS from 30 million kilometers away. This image showcases the comet’s fuzzy coma, a cloud of dust and gas released as it warms near the Sun. Scientists hope these images will help estimate the size of the comet’s nucleus and analyze the particles within the coma. Shane Byrne, HiRISE principal investigator, notes, ‘Observations of interstellar objects are still rare enough that we learn something new every time.’ Leslie Tamppari, MRO’s project scientist, adds, ‘This is a unique chance to study a passing space object alongside our usual Mars observations.’
Even Perseverance, the rover exploring Mars’ surface, joined the effort. On October 4, 2025, it used its Mastcam-Z camera to capture a long-exposure image of the comet as it streaked across the Martian sky. Though 3I/ATLAS appears faint in the photo, it’s a valuable addition to the growing dataset helping scientists unravel its mysteries.
Now, here’s a thought-provoking question for you: As we study interstellar visitors like 3I/ATLAS, are we just scratching the surface of what’s out there? Could these objects hold the key to understanding the diversity of our galaxy, or even the origins of life itself? Share your thoughts in the comments—let’s spark a cosmic conversation!
