Interstellar comet 3I/ATLAS reveals symmetrical jets and rare nickel emission in Hubble images
An unprecedented observation by Telescópio Espacial Hubble has revealed extraordinary features in the interstellar comet 3I/ATLAS, the third object confirmed to visit our Sistema Solar from another star. The images, captured in January 2026, show jets of gas and dust emanating from its nucleus with almost perfect geometric symmetry, a phenomenon that challenges conventional explanations of cometary activity.
In addition to the intriguing structure, spectroscopic analyzes detected anomalous nickel emission, in proportions rarely seen in celestial bodies in our own system. Essa’s unusual chemical composition, coupled with the dynamics of the jets, has intensified the scientific debate about the nature and origin of these cosmic travelers, raising new questions about the formation of planetary systems beyond our own.
The dataset collected during a rare alignment between the comet, Terra and Sol provided a detailed view that is being closely analyzed by astronomers around the world. The discoveries not only deepen the mystery surrounding 3I/ATLAS, but also offer a unique opportunity to study material originating from a distant stellar environment.
An unprecedented cosmic geometry
The most surprising feature observed in 3I/ATLAS is its material ejection structure. Images of Hubble, processed by independent researchers including astrophotographer Toni Scarmato, revealed three main jets of gas and dust emerging from the comet’s nucleus, separated by exact angles of 120 degrees. Essa geometric precision, with a margin of error of less than 0.001 degrees, is notably different from the normally chaotic and irregular sublimation processes seen in Sistema Solar comets, where jets are often sporadic and random. The observation was possible thanks to a celestial alignment that occurred on January 22, 2026, when the angle between the comet, Terra and Sol was just 0.69 degrees. The Essa setting allowed the Hubble to capture details that would otherwise be obscured by sunlight. One of the jets, known as the anti-tail, pointed directly at Sol, maintaining this orientation stably, suggesting a continuous readjustment mechanism as the comet’s nucleus rotates, estimated over a period of 7.1 hours. The persistence of this symmetrical pattern across multiple exposures reinforces the idea that 3I/ATLAS activity is governed by physical processes that are not yet understood.
The trajectory of the interstellar visitor
Comet 3I/ATLAS was officially identified on July 1, 2025, using the ATLAS telescope system (Asteroid Terrestrial-impact Last Alert System), a project funded by NASA and located on Chile. Investigações in astronomical archives revealed previous detections of the object, dating back to June 14 of the same year, allowing a more accurate calculation of its route.
Its trajectory was quickly classified as hyperbolic, a mathematical signature that confirms its origin from outside Sistema Solar. Objetos with this characteristic travel at such a high speed that the gravity of Sol is not enough to capture them in an orbit, ensuring that they only visit us before continuing their journey through deep space.
The comet reached its point of closest approach to Sol, perihelion, on October 30, 2025, at a distance of approximately 1.4 astronomical units, which placed it within the orbit of Marte. During this phase, solar heating caused the sublimation of ice on its surface, creating a diffuse atmosphere of gas and dust called a coma.
The chemical anomaly of nickel
Spectroscopic analyses, which break down the light reflected by the comet to identify its chemical composition, brought another big surprise. From October 2025 onwards, the instruments recorded a significant increase in the emission of nickel atoms, which reached ten times greater than the initial levels. The most intriguing thing is that this increase was not accompanied by a proportional increase in iron emission, as would be expected based on the composition of asteroids and comets in our system.
This high nickel to iron (Ni/Fe) ratio was particularly pronounced when the comet was more than 2.5 astronomical units from Sol. The chemical separation between these two elements in such a cold environment is a puzzle for scientists, suggesting that the 3I/ATLAS material may have formed under very different conditions than those that gave rise to our Sistema Solar. As the comet approached Sol, the anomaly decreased, approaching more typical values, indicating a complex, temperature-dependent process.
Mysterious forces at work
In addition to its appearance and composition, the movement of 3I/ATLAS also proved unusual. The comet exhibited a non-gravitational acceleration, that is, a change in its speed that cannot be explained solely by the attraction of Sol and the planets. Esse phenomenon is common in comets and is caused by the reaction force of gas jets that escape from their surface, acting as small propellants.
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In the case of 3I/ATLAS, the deviation in its trajectory reached 16 degrees in relation to the path it would follow if only gravity were acting. Curiosamente, this value corresponds to exactly twice the opening angle observed in each of the individual jets, which was eight degrees, suggesting a strong correlation between the activity of the jets and the change in the comet’s orbit.
What the scientific community says
The set of anomalous features of 3I/ATLAS has reignited a vigorous debate in the astronomical community. Astrophysicist Avi Loeb, from Universidade of Harvard, known for his theories about the first interstellar visitor, ‘Oumuamua, highlighted that the combination of geometric symmetry, unusual chemical composition and precise acceleration could be indicative of an unnatural origin.
Loeb argues that, although the natural explanation is the most likely, science should not rule out the possibility of investigating the object in search of technosignatures, that is, evidence of alien technology. Ele argues that the precision of the jets is difficult to explain through known geological processes.
On the other hand, most experts believe that the phenomena observed in 3I/ATLAS are natural manifestations, albeit extreme and unprecedented. The main hypothesis is that interstellar comets, formed in other stellar systems, have a much greater diversity of compositions and structures than that found in bodies from our own system.
Data from other missions, such as NASA’s TESS, corroborate the idea of natural activity by recording variations in brightness consistent with the rotation of an irregular body that releases gas. Complete analysis of data collected by different observatories around the world will be crucial in determining the true nature of the comet.
Projections for the coming months
Comet 3I/ATLAS will continue to be a study target for professional and amateur telescopes until mid-2026, as it moves away from Sol on its journey back to interstellar space. An important event on its outbound trajectory will occur in March 2026, when it will pass relatively close to Júpiter’s sphere of gravitational influence.
A legacy of discoveries
The passage of 3I/ATLAS through our cosmic neighborhood represents a milestone for astronomy. Cada interstellar visitor, from the enigmatic 1I/’Oumuamua to the more “classic” 2I/Borisov, and now the peculiar 3I/ATLAS, adds fundamental pieces to the puzzle about the formation and diversity of planetary systems in Via Láctea.
These observations allow us, for the first time, to directly analyze samples of material from other stars, providing information that would be impossible to obtain otherwise. The comet is now on a definitive exit trajectory, but the data it left behind will continue to fuel research and scientific debate for many years to come.
