Robots, they’re just like us—fascinated by the skies above them and the mysteries they hold.
And now, NASA has revealed that its Mars Perseverance rover might have spotted a mysterious visitor from beyond our solar system. A recent photo taken by the rover on Saturday shows a bright streak of light across the Martian sky, which NASA believes may have been the recently discovered interstellar comet, 3I/Atlas. This space-faring visitor made its closest approach to Mars on October 3, flying by at a distance of 18.6 million miles (30 million kilometers) above the surface of the Red Planet.
Although the object has not yet been confirmed as the comet by NASA, the agency had been anticipating the interstellar comet’s visit to the Red Planet and had primed the Perseverance rover to observe the comet during its closest approach.
On October 3, Comet 3I/ATLAS will make its closest approach to Mars. ("Close" being about 17 million miles from the surface 🙃) Use Eyes on the Solar System to follow the interstellar comet's journey and see where else it's headed. https://t.co/gKfhPOSplh pic.twitter.com/l2356e8ZXI — NASA JPL (@NASAJPL) September 26, 2025
Alien visitor
Comet 3I/ATLAS was first spotted in data collected by the Asteroid Terrestrial-impact Last Alert System (ATLAS) between June 25 and 29, and then again on July 1. The object was discovered hurling through the solar system on a hyperbolic trajectory, leading scientists to believe that it was not bound by the Sun’s gravity, meaning that the comet doesn’t follow a closed orbital path around our star, according to NASA.
On July 2, the International Astronomical Union’s Minor Planet Center confirmed that the likely comet came from outside our solar system,. It marked the third discovery of an interstellar object passing through Earth’s stellar neighborhood. Interstellar objects like 3I/Atlas offer scientists a rare glimpse into the composition and formation of other star systems beyond our own, and their journey helps give clues to our galaxy’s more distant neighbors.
In late October, 3I/Atlas disappeared from Earth’s view, hiding behind the Sun. It will remain concealed from ground-based observatories until December. But as it cruises through the solar system, there may be a chance to view it using the various probes orbiting other planets.
The European Space Agency also hoped to observe the interstellar object during its close approach to Mars using two satellites, the Mars Express and the ExoMars Trace Gas Orbiter, while NASA hopes its Martian rovers and fleet of orbiters will also be able to capture multiple views of the comet during its brief flyby.
After Mars, Comet 3I/Atlas is headed toward Jupiter in March 2026. From there, it will likely exit the solar system and head back out into interstellar space, perhaps never to return.