Did NASA’s Perseverance Spot Interstellar Comet 3I/ATLAS in Mars’ Night Sky?

Unusual Light Streak Detected by Mars Rover

NASA’s Perseverance rover on Mars captured an intriguing streak of light moving across the Martian sky. The incident happened on October 4, and the rover’s Right Navigation Camera (Navcam) documented the phenomenon. The timing coincides with the pass of the interstellar comet 3I/ATLAS near Mars, as reported by the European Space Agency (ESA).

Despite the excitement, neither NASA nor the Jet Propulsion Laboratory, which operates Perseverance, has confirmed whether the streak is actually the passing comet. The ongoing U.S. government shutdown limits available information, as officials have not issued an official statement.

NASA previously announced that Perseverance would help observe the interstellar comet as it journeyed through our solar system. A social media post suggested that Perseverance might have seen 3I/ATLAS last night, noting a faint light in the constellation Corona Borealis where the comet was expected to appear.

a streak of light on a black background
Possible sighting of interstellar comet 3I/ATLAS from Mars, captured by NASA’s Perseverance rover.

Some speculation on social media proposed that the cylindrical appearance of the streak suggested an alien spacecraft. However, astrophysicist Avi Loeb explained that the stripe results from the image stacking process; during exposure, the comet moved across the sky, creating a streak rather than a circular spot in a single snapshot.

3I/ATLAS is currently passing by Mars at a closest distance of approximately 18.6 million miles (30 million km) as it moves through our solar system. The European Space Agency planned to use Mars Express and the ExoMars Trace Gas Orbiter to observe the comet, complementing earlier observations by the Hubble and James Webb Space Telescopes, which captured images and studied its composition.

three concentric rings with a dotted line passing through the center of them
Illustration showing the path of interstellar comet 3I/ATLAS relative to Earth, Mars, and spacecraft in the inner solar system in 2025.

Ongoing mission plans may be affected by the U.S. government shutdown, which has furloughed most NASA employees and halted some communication efforts. Nonetheless, the agency continues to monitor this rare interstellar visitor as it traverses our solar neighborhood.