Solar Heating Strips Surface Layers From Interstellar Comet
The 2025 detection of 3I/ATLAS provides new data on how radiation and heat alter interstellar objects during solar system transits.
Updated on Oct. 25, 2026 in Physics
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Interstellar comet 3I/ATLAS, detected in July 2025, lost between 18 and 58 billion kilograms of mass as it traversed the solar system. Researchers calculated that solar heating stripped 1.7 to 5.2 meters of surface material from the object.
Why it matters
Quantifying these losses helps astronomers understand the surface erosion processes and chemical evolution of interstellar objects as they interact with solar radiation.
The comet lost between 1.7 and 5.2 meters of surface material directly from solar heating. Total erosion depth increases to 26.7 meters if the dust-to-gas mass ratio reaches four.
The details
Researchers modeled mass loss by tracking the velocity of substances within the coma—the fuzzy envelope of gas and dust surrounding a comet nucleus—before and after perihelion, or the point in orbit closest to the sun. The team also determined that cosmic radiation converted outer-layer carbon monoxide into carbon dioxide, creating an altered zone estimated at 15 to 20 meters deep.
Timeline
July 2025: Interstellar comet 3I/ATLAS was detected.
The Tech Race
This study refines our understanding of interstellar object composition by benchmarking 3I/ATLAS against the limited data available for earlier visitors like 1I/‘Oumuamua. It establishes a baseline for how interstellar bodies erode under solar pressure, a critical metric for future deep-space observational missions.
This research provides planetary scientists with precise models for evaluating the chemical makeup of non-local objects passing through our solar system. The findings serve as a technical reference point for upcoming telescope missions tasked with identifying similar interstellar transients.
The takeaway
The study confirms that interstellar objects undergo significant surface transformation as they enter the solar system, with radiation altering layers up to 20 meters deep. Astronomers will continue to watch for future interstellar detections to see if these erosion figures remain consistent across different mass compositions.
Further reading
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Source note: This article includes information reported by PravdaReport.
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