The interstellar comet 3I/Atlas was detected on July 1, 2025 by the Atlas telescope system, located at Río Hurtado, in Chile.
This object, the third confirmed interstellar to enter Sistema Solar, has a hyperbolic orbit that differentiates it from local bodies.
With dimensions estimated between 20 and 30 kilometers, 3I/Atlas travels at more than 90 kilometers per second and approaches Júpiter in November 2025.
Its arrival raises questions about its composition and trajectory, with initial observations pointing to unusual features.
Anomalies observed in 3I/Atlas
Astronomers have recorded six major anomalies in 3I/Atlas since its detection.
The chemical composition reveals a high content of nickel and industrial compounds, with a low presence of water and iron, which differs from typical comets.
Non-gravitational acceleration suggests additional forces beyond solar and planetary attraction.
- Jet of material facing the Sol, forming a rare anti-glue.
- Early water vapor activity, at 3.5 astronomical units from Sol.
- Eat dominated by carbon dioxide rather than water.
This data was collected by telescopes such as the Very Large Telescope, on the Chile.
The unstable rotation and brightness variations every 16.16 hours challenge standard nuclear rotation models.
Trajectory and recent observations
3I/Atlas follows a route that takes it close to Marte in October 2025, Vênus and now Júpiter.
Nasa missions captured images during its pass by Marte, revealing an inverted tail stretching for millions of kilometers.
The speed of 220 thousand kilometers per hour confirms its origin external to the Sistema Solar.
On December 19, 2025, the object will reach 270 million kilometers from Terra, before moving away permanently.
Spectral observations indicate unidentified emission lines in known cometary material.
The low density and irregular shape suggest an elongated structure, similar to Oumuamua, but on a larger scale.
Technological hypothesis proposed by Avi Loeb
Avi Loeb, astrophysicist from Harvard, published an analysis in November 2025 on the possible technological origin of 3I/Atlas.
He highlights the coincidence between the perijove of Júpiter and the radius of Hill as a potential artificial signature.
The observed jets may indicate thrusters, requiring less mass loss than natural ice sublimation.
Loeb mapped the anomalies in an article with collaborators from Iniciativa to Estudos Interestelares, in Londres.
The hypothesis considers the Paradoxo of Fermi and the solution of Floresta Escura, where civilizations avoid detection.
Reactions from the astronomical community
Astronomers such as Diego Bagú, from Argentina, classify 3I/Atlas as a common comet, despite its peculiarities.
Phenomena such as anti-glue result from interactions with the solar wind, according to conventional analyses.
The object inspires amateurs and young people, with an increase in interest in astronomy after publications by Loeb.
Global observatories, including the one at Chile, have intensified monitoring to capture data during the solar approach.
Criticism points out that technological speculations are premature without direct evidence of technosignals.
Comparison with previous interstellar objects
3I/Atlas differs from 1I/Oumuamua, detected in 2017, by its larger size and cometary activity.
While Oumuamua lacked coma, 3I/Atlas exhibits variable outgassing and unique light polarization.
2I/Borisov, from 2019, had a more typical composition, with gases such as CN and C2 present.
- Oumuamua: Alongado, no tail, subtle non-gravitational acceleration.
- Borisov: Standard gaseous Cometa, hyperbolic orbit confirmed.
- 3I/Atlas: Núcleo of 20 km, mass above 33 billion tons, tumbling rotation.
These differences expand the repertoire of interstellar bodies studied.
The detection of three objects in eight years suggests a higher frequency of visitors than expected.
Implications for future studies
Continuous monitoring of 3I/Atlas could reveal more about the formation of distant planetary systems.
Ground- and space-based telescopes plan additional observations during perihelion in December 2025.
Anomalous thermal data, such as changes not compatible with ice sublimation, require revised models.
The absence of collimated dust jets, despite the brightness, questions ejection mechanisms.
Subsequent research will prioritize early detection of technosignals in interstellar objects.
The case reinforces the need for international protocols for tracking cosmic visitors.