O comet 3I/ATLAS continues to surprise the world's scientific community. This interstellar visitor, who came from another solar system, has just had his most detailed image captured by the Hubble Space Telescope. The record, made on July 21, 2025, reveals unprecedented features of this celestial body that crosses our planetary system at an impressive speed of 210 thousand km/h.
The Best Image Ever Registered
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An international team of astronomers managed to get the sharpest picture of comet 3I/ATLAS So far. The images show fascinating details: a plume of dust being ejected from the sun-heated side and a weak tail pointing away from the core, resulting from the pressure of solar radiation.
Experts estimate that the diameter of the comet varies between 320 meters and 5.6 kilometers. Its core remains hidden by a dense cloud of dust and gas, but we know it's solid and cold. Every second, the 3I/ATLAS It loses between 6 and 60 kg of dust, a rate similar to that of comets in our own Solar System when they are 480 million miles from the Sun.
A Billion Years Traveler
Although he behaves similarly to local comets, the origin of comet 3I/ATLAS It's completely different. This object was born in a distant planetary system somewhere in the Milky Way. For billions of years, he wandered through space interstellar until you get close to us.
Its extreme speed of 210 thousand km/h – the highest ever recorded for such an object – results from the effect of "gravitational slinging". During his cosmic journey, countless encounters with stars and interstellar clouds accelerated him continuously.
Discovery and Observation
O comet 3I/ATLAS it was originally detected on July 1 2025 by the Asteroid Earth Impact Alert System (ATLAS), when it was 675 million kilometers from the Sun. This is just the third interstellar visitor of this kind already detected crossing our Solar System.
Earth telescopes will be able to observe it until September, when it will be very close to the Sun. The comet must reappear in start December, emerging on the other side of our central star.
Historical Meeting with Space Probes
An even more exciting discovery awaits the scientific community. Astronomers predict a rare event: interstellar comet 3I/ATLAS can cross the path of two active space missions between the end of October and early November 2025.
Europa Clipper (NASA) and Hera (European Space Agency) probes can cross the comet's tail. If that happens, it will be the first time a human spacecraft has crossed the tail of a comet from outside the Solar System.
Unique Opportunity Window
According to the calculations, the Hera probe may pass through the tail of the comet 3I/ATLAS until November 1, while Europe Clipper can cross the same region between October 30 and November 6. The ionic tail, formed by the interaction between solar wind particles and comet gas, can extend for millions of kilometers.
Even without a collision direct, the spacecraft could detect signs of encounter, such as variations in magnetic field and ion flow in space. It would be a unique opportunity to study directly as a comet formed outside the Solar System reacts to the solar environment.
Scientific Importance
The interest of researchers goes far beyond the curiosity. Detect ions or particles associated with 3I/ATLAS it would allow comparing its composition and structure with local comets. This would help rebuild the chemical history of other planetary systems.
"It would be a unique chance to directly observe the effects of solar wind on an interstellar visitor," the authors of the study published by the American Astronomical Society highlight.
Challenges and Limitations
Scientists emphasize that this prediction is based on mathematical models and there are still uncertainties about the actual density and extent of the tail. The probes were not specifically designed to study comets, which limits the accuracy of possible measurements.
Even so, NASA and ESA teams are preparing to seize this extraordinary opportunity in case the intersection actually occurs.
Next Remarks
The details of Hubble findings have been described in a scientific paper accepted for publication in The Astrophysical Journal Letters. Meanwhile, other advanced instruments prepare to study the comet 3I/ATLAS.
The Space Telescope James Webb, maintained by NASA and the European Space Agency (ESA), should help expand knowledge of this mysterious object. The idea is to more clearly determine both its dimensions and its chemical composition.
A Marco in Space Exploration
If confirmed, the meeting between the comet 3I/ATLAS and space probes will transform a simple passage of an interstellar comet into a historical moment for the space exploration. It will offer unprecedented data on how bodies coming from other stars behave when interacting with our Sun.
This event represents a unique convergence between advanced space technology and a cosmic visitor of distant origin. The collected data may revolutionize our understanding of the formation and evolution of planetary systems throughout the galaxy.
O comet 3I/ATLAS It continues its journey through our planetary system, carrying with it secrets from distant worlds. Each observation brings us closer to unraveling the mysteries of this interstellar traveler who has spent billions of years visiting us.
sources: Metropolis | Galileo Magazine
