Hubble reveals jets with rare symmetry in the interstellar comet 3I/ATLAS and intrigues astronomers
Recent images captured by Telescópio Espacial Hubble of the interstellar comet 3I/ATLAS are generating intense debate in the scientific community. The records, obtained in January, reveal the presence of four jets of material emanating from the comet’s nucleus, exhibiting a rarely observed geometric symmetry. The precise arrangement of these structures challenges conventional explanations and opens new avenues of investigation into the nature of objects coming from other stellar systems.
The most notable feature is the configuration of three of the jets, which are separated by an exact angle of 120 degrees, forming a perfect triangular pattern. A fourth jet, visibly longer and collimated, points directly in the direction of Sol, a formation known as the anti-tail. Essa geometric organization led researchers to apply special image processing filters to highlight the structures and analyze their behavior over time.
Comet 3I/ATLAS is only the third confirmed interstellar visitor to be detected in our Sistema Solar, following in the footsteps of 1I/’Oumuamua and 2I/Borisov. Descoberto in July 2025, its hyperbolic trajectory confirms that it is not gravitationally bound to our Sol and will eventually return to deep space. Detailed analysis of their composition and activity offers a unique opportunity to study primordial matter from a distant planetary system.
The Interstellar Visitor’s Journey
The detection of 3I/ATLAS was carried out by the Asteroid Terrestrial-impact Last Alert System (ATLAS) warning system, located at Chile, on July 1, 2025. Inicialmente classified as a possible asteroid due to its trajectory, subsequent observations revealed a diffuse coma and cometary activity, confirming its nature. The object entered Sistema Solar at an impressive speed of 58 kilometers per second, a clear indication of its extrasolar origin. Essa’s velocity increased to a peak of 68 km/s as it approached Sol, reaching perihelion in October 2025.
The comet’s trajectory is one of the main focuses of study. Diferente of the comets native to Sistema Solar, which have elliptical orbits around Sol, that of 3I/ATLAS is open and hyperbolic. Isso means it is just passing through, having been ejected from its home star system billions of years ago. Sua closest passage to Terra occurred in December 2025, at a safe distance of 270 million kilometers. Agora, the object moves away, with its exit route taking it to approach the planet Júpiter in the coming months.
The precise look of the Hubble telescope
To unlock the secrets of 3I/ATLAS, astronomers turned to the observational power of Telescópio Espacial Hubble. A series of images were captured between the end of 2025 and the beginning of 2026, allowing us to monitor the evolution of the comet’s activity as it interacted with the inner Sistema Solar environment. The use of advanced instruments and, mainly, the Larson-Sekanina digital filter, was crucial to highlight the dust and gas structures. Esse processing method subtracts the soft glow of the coma, revealing the thinner, more directed jets that extend tens of thousands of kilometers from the core. Essas detailed observations are essential, as they provide clues about the rotation of the nucleus, estimated between 7 and 16 hours, and the location of active areas on its surface.
Four jets and an intriguing geometry
Analysis of the processed images revealed the unusual configuration of the four jets. Enquanto the anti-solar jet is a known phenomenon, although not common, the triangular symmetry of the other three is what caught the most attention from experts. The 120-degree angular separation between them is mathematically perfect, creating a balanced pattern that appears to rotate along with the comet’s nucleus.
This arrangement raises questions about the physical mechanisms that could produce such regularity. In comets, jets are typically formed by the sublimation of volatile ices when heated by Sol, expelling gas and dust through fissures or active areas on the surface. However, the occurrence of three emission sources so perfectly spaced is statistically unlikely under conventional models.
Astrophysicist Avi Loeb, known for his theories about ‘Oumuamua, analyzed dozens of images of Hubble in collaboration with other researchers. Ele highlighted that although a natural explanation cannot be ruled out, the likelihood of such symmetry occurring by chance is extremely low, encouraging further investigation into physical processes not yet understood in cometary nuclei.
Hypotheses to explain the phenomenon
The astronomical community mostly seeks explanations within known natural processes. The main hypothesis is that the surface of the 3I/ATLAS nucleus has pockets of volatile ice, such as carbon dioxide (CO2), located at specific points that, due to the rotation and orientation of the comet, are activated to create the appearance of symmetrical jets.
Spectroscopic data obtained by other observatories, such as Telescópio Espacial James Webb, confirmed that the comet’s composition is extremely rich in CO2 compared to water, which differentiates it from most comets in our Sistema Solar. Essa abundance of CO2 could explain the intense activity observed even at great distances from Sol, where temperatures are not sufficient to sublimate water ice.
Another possibility is that the geometry is a coincidence of perspective, a rare alignment that is only visible from our vantage point at Terra. Casos of peculiar geometries have already been observed in other comets, although the perfection seen in 3I/ATLAS is unprecedented. The stability of the long anti-solar jet, for example, can be explained by a minimal misalignment between the comet’s rotation axis and its direction relative to Sol.
To date, programs searching for extraterrestrial intelligence, such as Breakthrough Listen, have not detected any anomalous radio emission coming from the comet’s direction. The absence of artificial signals reinforces the thesis that the jets are the result of natural phenomena, although extremely rare and of great interest to cometary physics.
Comparisons with ‘Oumuamua and Borisov
The arrival of 3I/ATLAS enriches the comparative study of interstellar objects. The first, 1I/’Oumuamua, intrigued scientists due to its extremely elongated shape and lack of a visible coma, despite exhibiting non-gravitational acceleration. Já the second, 2I/Borisov, looked a lot like our own Sistema Solar comets, with a well-defined coma and tail.
3I/ATLAS positions itself as a fascinating intermediary, presenting clear cometary activity, but with unique characteristics such as symmetrical jets. Essas differences underscore the diversity of small bodies that exist in other star systems, providing valuable data about planet formation processes elsewhere in the galaxy.
Next steps in observation
The comet continues its journey out of Sistema Solar and will make its closest approach to Júpiter in March 2026, passing approximately 53 million kilometers from the gas giant. If Embora’s gravitational interaction with Júpiter may slightly alter its outgoing trajectory, it will not be enough to capture it in a solar orbit.
The impact of the discovery on astronomy
Ongoing 3I/ATLAS analysis promises to provide crucial information about the chemical composition and physical structure of bodies formed around other stars. Cada new data collected helps scientists piece together the puzzle of the formation of planetary systems, including our own.
Even if the explanation for symmetric jets proves entirely natural, the 3I/ATLAS case has already established itself as a landmark. Ele reinforces the importance of investigating apparent anomalies with scientific rigor and demonstrates how the observation of rare objects can expand the frontiers of our knowledge about the universe.
