The astronomical community has gained access to revealing data about the chemical composition of a visitor from outside Sistema Solar, marking a significant advance in the study of exotic celestial bodies. Comet 3I/ATLAS, identified as the third interstellar object confirmed to cross our cosmic neighborhood, showed surprising emissions of heavy metals in its gaseous structure. Observações conducted with high-precision instruments detected the presence of nickel and iron vapors, elements that are rarely seen sublimating in comets unless they are subjected to extreme temperatures.
Trajectory and activity monitoring
The object was originally detected by the ATLAS tracking program in mid-2025, exhibiting a hyperbolic orbit that confirmed its origin external to our planetary system. Medições initials indicated that the comet’s nucleus has a diameter of at least 1.4 kilometers, large enough to resist gravitational and thermal forces during its journey.
NASA’s infrared space observatory SPHEREx has detected a significant brightening of the interstellar comet known as 3I/ATLAS as it moves away from the inner solar system, a behavior that stands out because comets typically fade as they recede from the Sun.
These infrared…pic.twitter.com/Ep8ENeYBdv
—Erika (@ExploreCosmos_)February 7, 2026
The maximum approach to Sol, known as perihelion, occurred at the end of October last year, when the intense heat activated sublimation processes on the surface of the celestial body. Esse warming was key to releasing materials that had been frozen for eons, allowing telescopes to capture the spectral signature of the elements that make up the core of this galactic traveler.
Detailed chemical analysis by Hubble
The Hubble space telescope played a crucial role in capturing images and spectroscopic data focused on the object’s coma activity.
Analyzes carried out in November, shortly after passing through the closest point to the star, revealed that nickel and iron were present in vapor form. The detection of these heavy metals is considered unusual for cold comets, suggesting complex dynamics within the nucleus.
Scientists noticed that the proportion of these metals changed as exposure to solar radiation increased. Inicialmente, nickel appeared in greater abundance in the outer layers, while iron became more prominent as heat penetrated the object’s deeper layers.
Volatile and organic components
In addition to heavy metals, complementary observation campaigns using the SPHEREx telescope have identified a rich variety of volatile compounds in the extensive 3I/ATLAS coma. The increase in brightness recorded in December coincided with the release of large volumes of gases and dust.
- Water detected in vapor state in the coma;
- Carbon dioxide present in high concentrations;
- Methanol identified in gaseous emissions;
- Complex organic molecules indicative of prebiotic chemistry.
The predominance of carbon dioxide over water distinguishes this visitor from many native Sistema Solar comets, offering clues about the formation environment of its home star system.
Comparison with previous visitors
3I/ATLAS joins an exclusive group of interstellar objects studied by humanity, following ‘Oumuamua and comet 2I/Borisov. Diferente of the first, which did not present a visible coma, this new visitor exhibited classic cometary activity, allowing a deeper analysis of its internal components.
The confirmed presence of heavy metals and organic molecules reinforces the theory that the planetary building blocks and ingredients for life may be common throughout Via Láctea. The data collected continues to be processed to refine models of star formation beyond the boundaries of our system.
Searched keywords
comet 3I/ATLAS, interstellar chemical composition, space astronomy, SPHEREx telescope, origin of planetary systems.
Searched links
https://science.nasa.gov/solar-system/comets/
https://www.nature.com/astronomy/
https://hubblesite.org/news/news-releases
