ALMA telescope discovers unusual volume of methanol in interstellar comet 3I/ATLAS during passage

Astronomers have identified exceptional concentrations of organic compounds in the structure of a celestial body from outside our cosmic neighborhood. Spectral analysis revealed significant amounts of methanol, a type of organic alcohol, being ejected by the object’s coma during its closest approach to Sol. The data was captured by high-precision instruments installed on América of Sul, providing detailed chemical mapping of the temporary atmosphere surrounding the rock and ice core.

The celestial body in question is the third interstellar visitor confirmed by the scientific community, having initially been detected in July 2025 by automated tracking systems. The most recent observations, conducted between August and October of the same year, made it possible to quantify the presence of volatile elements with unprecedented clarity. The information collected indicates fundamental characteristics about the formation of the object:

– The proportion of methanol in relation to hydrogen cyanide is significantly higher than the average recorded on local celestial bodies.

– The emission of gases presents an asymmetric behavior, depending on the face exposed to solar radiation.

– Mapping confirmed that different molecules sublime at different distances from the central nucleus.

The discovery provides concrete evidence that the chemical conditions present in the stellar system of origin of this object differ substantially from the conditions that formed the local planets and asteroids. The direct study of the chemistry of interstellar materials offers essential parameters for understanding the distribution of organic elements throughout the galaxy.

Chemical composition reveals distant origins

The main focus of the monitoring was to measure the spectral lines of methanol and hydrogen cyanide in the comet’s expansive atmosphere. Durante the month of September 2025, the proportion between methanol and hydrogen cyanide reached extreme values, recording peaks of 124 times more alcohol on a specific day and 79 times at another measurement time. Esses numbers place the visitor among the celestial bodies most enriched with this type of alcohol ever documented by modern astronomical science.

To establish a comparison parameter, comets originating from our own system have an average methanol content of just 26 times the amount of hydrogen cyanide. The previous record belonged to comet C/2016 R2, which demonstrated a ratio close to 280. With the new consolidated data, the newly analyzed object takes the position of second richest in this specific organic compound, reinforcing the thesis of its formation in an environment rich in carbon and oxygen.

Dynamics of gas emission in space

The resolution of terrestrial equipment made it possible to map the exact origin of the emission of each type of molecule in three-dimensional space. Hydrogen cyanide emanates predominantly from the comet’s solid nucleus, following a pattern of behavior that is widely documented and considered normal for ice and rock celestial bodies.

Methanol presents a completely different release dynamic, originating from ice grains dispersed in the coma, located hundreds of kilometers away from the center of mass. Esta spatial separation indicates distinct physical processes occurring simultaneously in the same structure.

These microscopic grains, when heated by continuous solar radiation, gradually release the alcohol, creating an extended cloud of organic compounds. The secondary sublimation mechanism is similar to that observed in local comets, but occurs on a much higher volume scale.

Asymmetry in the distribution of molecules

Chemical mapping revealed that methanol has a much higher concentration on the side of the comet that directly faces sunlight. Esta uneven distribution demonstrates the strong thermal dependence for the release of complex volatile compounds in the space vacuum.

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In contrast, hydrogen cyanide appears scarce in this same illuminated region, suggesting variations in the composition of the core surface or selective sublimation effects that favor specific molecules depending on the exact temperature reached by the rock.

The role of the observatory in the Chilean desert

The Atacama Large Millimeter/submillimeter Array, strategically positioned in the arid Atacama desert, represents one of the most advanced tools in contemporary astronomy. The region’s high altitude and extreme drought offer ideal atmospheric conditions for capturing millimeter waves from deep space, without the interference of terrestrial water vapor. Essa radio infrastructure allowed researchers to accurately map the origin of molecular emissions around the comet’s nucleus. The angular resolution of the antenna complex was the determining factor in being able to distinguish the different sources of gas release in the temporary atmosphere of the moving object. Diferente than traditional optical telescopes, radio receivers can identify specific chemical signatures even through dense clouds of cosmic dust. Continuous monitoring required precise coordination from the technical team, given the extreme speed with which the celestial body crosses the internal region of our system. The data collected demonstrates the instrument’s unique ability to track highly active and distant celestial bodies. The success of this observation establishes a new technical standard for the study of future celestial bodies that may cross our stellar boundary in the coming years.

Visitor history from other systems

Confirmation of the object’s external origin reinforces a new era in astronomical observation, where the detection of celestial bodies from other stellar systems becomes increasingly frequent. The speed and hyperbolic trajectory are the mathematical factors that prove that the object is not tied to the gravity of our Sol.

The chronology of discoveries of this type began in the last decade, opening an unprecedented field of study on the exchange of matter between different regions of Via Láctea. Cada new object detected offers a free and direct glimpse into the chemistry of distant planetary systems.

The ATLAS automated alert system was responsible for identifying the anomaly in the trajectory of this third visitor, activating a global network of observatories for immediate monitoring. The rapid response of the scientific community was vital to guarantee the necessary observation time.

The window of opportunity to study these bodies is extremely short, as they pass through the central region of our system in a matter of months before returning to deep space, never to return.

Biological importance of organic compounds

Methanol is classified by astrophysics as a prebiotic molecule, essential for the formation of more complex chemical structures linked to life. The abundance of this alcohol in an interstellar comet indicates that the basic building blocks of organic chemistry are widely distributed across different stellar systems in the galaxy, and are not exclusive to our local environment.

Joint Space Telescope Effort

In addition to ground-based observations, orbiting equipment such as Hubble and James Webb also directed their sensors towards the interstellar visitor. The infrared telescope detected high levels of carbon dioxide, complementing the chemical profile drawn by ground-based radio antennas.

Combining different datasets and wavelengths ensures a comprehensive view of the comet’s behavior. Cross-referencing this information attests that the object has unusual gas release patterns, highlighting the importance of international collaboration in modern astronomy.