Signs of disintegration of interstellar comet 3I/ATLAS are detected during its solar approach

The interstellar comet 3I/ATLAS, a visitor from another star system, has begun to show clear signs of fragmentation. The phenomenon was recorded for the first time on October 30, 2025, as the object approached its closest point to Sol, known as perihelion, at a distance of 1.4 astronomical units, which is equivalent to approximately 210 million kilometers.

The intense heat of Sol is accelerating the sublimation of the volatile ices that make up its core, resulting in the release of jets of gas and dust. Este rapid warming process is the direct cause of the structural instability that leads to its gradual disintegration, an event eagerly awaited by the global scientific community.

Astronomers from NASA and Agência Espacial Europeia (ESA) are monitoring the event in real time using a network of ground and space telescopes. The comet’s hyperbolic trajectory, calculated with high precision, confirms its origin external to our Sistema Solar, making each data collected a valuable piece to understand the formation of other planetary systems.

The hyperbolic trajectory confirms the single passage

Unlike the periodic comets that orbit Sol, 3I/ATLAS follows an open, or hyperbolic, orbit that will take it to cross Sistema Solar only once, without any chance of returning. Descoberto near the orbit of Júpiter by the ATLAS telescope, located at Chile, the comet is estimated to have traveled for millions of years since it was ejected from its home star system.

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Experts suggest that its expulsion was likely caused by gravitational interactions with massive stars or giant planets in its home system. The object’s current speed, in excess of 60 kilometers per second, exceeds Sol’s escape velocity, ensuring that once it has circled our star, it will continue its journey through interstellar space indefinitely.

Chemical composition reveals distant origins

Spectroscopic analysis of the cloud of gas and dust surrounding the comet, known as its coma, revealed a fascinating and distinctive chemical composition. Foram identified rare organic molecules, which are not commonly found in comets native to our Sistema Solar. The detection of nickel vapor, in particular, suggests that 3I/ATLAS formed in extremely cold regions, far away from the intense radiation of its parent star. Essa condition allowed the preservation of primitive materials. The presence of hydrocyanic acid and other complex molecules offers a unique opportunity for direct comparisons with other interstellar visitors already observed, such as 1I/ʻOumuamua and 2I/Borisov. Cada chemical compound functions like a cosmic fossil, storing crucial information about planetary formation processes in other corners of the galaxy, allowing scientists to test and refine models about how stellar systems evolve.

Monitoring captures changes in real time

A vast network of observatories is dedicated to monitoring every moment of 3I/ATLAS activity. Telescópios in Havaí and Chile provide daily data on brightness variations and coma expansion. Além In addition, space missions orbiting Marte, such as Trace Gas Orbiter, are capturing images of the comet from a distance of about 30 million kilometers, offering a unique perspective free from the distortions of Earth’s atmosphere.

Signs of collapse increase with heat

As 3I/ATLAS approaches perihelion, the temperature at its surface increases dramatically, intensifying geological activity at its core, estimated to be less than a kilometer in diameter. Fissuras and fractures in the comet’s icy surface are causing sudden, violent eruptions that expel large amounts of material into space. Essas explosions are responsible for the abrupt variations in luminosity observed by telescopes.

This behavior is similar to what was recorded in the interstellar comet 2I/Borisov, which also released fragments as it approached Sol. The acceleration of the sublimation process increases the internal pressure of the nucleus, increasing the risk of a catastrophic fracture that could completely pulverize the comet in the coming hours or days. The scientific team remains on high alert to capture this possible total disintegration event.

International collaboration processes the data

Analysis of collected data is a coordinated effort on a global scale. NASA is working closely with ESA to perform real-time spectral analysis, deciphering the composition of the material ejected by the comet.

Understand the case: NASA’s James Webb Telescope reveals interstellar comet 3I/ATLAS older than the Sun

Observation satellites such as GOES-19 were able to record variations in the comet’s activity during its solar conjunction on October 21, a period when observation from Terra was difficult.

Research institutions at Austrália also contribute advanced computational models that simulate the sublimation process and dust dynamics. Preliminary data already indicates the release of an amount of dust equivalent to millions of particles per second.

Differences highlight unique dynamics

Detailed observations revealed unusual features in 3I/ATLAS. The dust plumes, for example, point directly toward Sol, an atypical behavior when compared to the tails of dust and ions traditionally seen on other comets, which are pushed by solar radiation and the solar wind.

This peculiar dynamic reinforces the idea that its composition is rich in extremely volatile materials, which supports the theory of its origin in very cold and dense molecular clouds, an environment conducive to the formation of celestial bodies with these characteristics.

The comet is currently approaching the orbit of Marte, which offers scientists a prime observation window to study its interaction with the interplanetary environment before it begins its trajectory out of Sistema Solar.

Images captured by Telescópio Espacial Hubble in July, when the comet was still 445 million kilometers away, already showed a teardrop-shaped dust cloud, indicating that the sublimation process was active even far from Sol.

More on this story: Ancestral comet: James Webb reveals celestial body that predates the formation of the Solar System

Forecasts indicate post-perihelion weakening

After reaching its closest approach to Sol in November, the tendency is for comet 3I/ATLAS to begin to visibly lose brightness as it moves away and its sublimation activity decreases. Current theoretical models predict that, if a total collapse of the nucleus does not occur, the comet could lose up to 20% of its total mass during its passage through Sistema Solar. The object’s minimum distance from Terra will be 270 million kilometers, a safe margin that completely eliminates any type of risk. With safety assured, the astronomical community’s focus remains entirely on collecting the scientific data that this rare visitor can provide, offering an unprecedented glimpse into the raw materials of other worlds.