Interstellar comet 3I/Atlas reveals abundant methanol as it passes by Jupiter

The interstellar comet 3I/Atlas released significant amounts of methanol as it approached Sol and passed close to Júpiter. The object had a ruptured outer layer that allowed the release of compounds such as water, methanol, carbon and hydrogen cyanide. Essa activity occurred as the comet followed its hyperbolic trajectory at high speed, confirming its origin outside of Sistema Solar.

Astronomers observed the comet’s unusual behavior through data collected at different phases of its passage. The detection included variations in gas emission that differ from the typical pattern seen in locally formed comets. 3I/Atlas was classified as the third interstellar object confirmed to cross the solar neighborhood.

• Discovered in July 2025 by the ATLAS telescope on Chile.
• Speed ​​relative to Sol estimated at around 68 km per second.
• Closest pass of Júpiter on March 16, 2026 at approximately 0.358 astronomical units.

Outer layer protected compounds for billions of years

The comet’s hardened crust acted as a natural shield against cosmic radiation during its long interstellar journey. Essa layer, possibly about 20 meters thick, kept volatile substances sealed inside until the influence of solar heat increased. Prolonged exposure to cosmic rays has chemically transformed the outer surface over hundreds of millions of years.

As 3I/Atlas approached Sol, gradual warming first allowed the sublimation of more heat-tolerant molecules. Somente in later stages solar radiation broke the external barrier. Esse process released jets of gas and enlarged the comet’s coma, exposing the preserved internal contents.

Chemical composition includes organic precursors

The comet presented a mixture of compounds that includes methanol in high proportions in relation to hydrogen cyanide. Measurements indicated methanol/HCN ratios between approximately 70 and 120 on specific observation dates. Esses values ​​place 3I/Atlas among the most methanol-rich comets ever recorded.

Methanol functions as a raw material for the formation of more complex molecules, including amino acids and sugars. Hydrogen cyanide, in turn, participates in the synthesis of amino acids associated with DNA and RNA structures. The presence of water was detected, although in lower concentrations than usual in Sistema Solar comets.

Carbon appears as the dominant component of the object’s mass, mainly in the form of carbon dioxide. Outros identified elements include carbon monoxide, carbonyl sulfide, ionized nickel, silicate dust, and additional organic molecules. Essa combination forms a set of ingredients relevant to prebiotic chemistry processes.

Passing through Júpiter expanded study opportunities

The comet reached its closest point to Júpiter on March 16, 2026, briefly crossing the gas giant planet’s Hill sphere. The high speed prevented any significant gravitational capture, with only a small change in trajectory possible during the two-week approach. Essa phase allowed detailed observations of the visitor’s physical and chemical behavior.

3I/Atlas exhibited non-gravitational acceleration, color changes, intense gas emission and structures such as two tails and an anti-tail. Esses features differentiate its behavior from typical comets formed in Sistema Solar. The observations occurred at times when the object was already demonstrating activity with an extensive coma.

Ancient origin reinforces scientific value of the object

Estimates indicate that the comet could be between 10 and 12 billion years old, making it potentially older than Sistema Solar itself, with an age of approximately 4.6 billion years. Essa antiquity suggests that it preserved materials from an early phase of galactic history. Sua possible origin in the thick disk of Via Láctea aligns with carbon isotopic composition data.

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3I/Atlas does not easily fit into direct comparisons with local comets due to characteristics such as non-gravitational acceleration and gas emission patterns. Cada new observation adds details about how these bodies form, age and respond to the stellar environment. The object continues its return journey to interstellar space without being captured by other outer planets.

Details of outgassing vary by molecule

Hydrogen cyanide comes mainly from the comet nucleus. Já methanol is released both from the nucleus and from ice particles in the coma that turn into gas upon heating. Essa difference in outgassing behavior was mapped in observations that tracked emissions in specific directions, including the side facing Sol.

Methanol production increased sharply over a period of months, following a power-law dependence on heliocentric distance. The comet showed activity even before the closest passage to Sol, with initial release of carbon monoxide, carbon dioxide and methanol in varying amounts. Detection of water vapor increased in later phases of the approach.

Hypothesis about cosmic distribution of compounds gains strength

The presence of these compounds in an object of interstellar origin suggests that molecules fundamental to biological chemistry can occur in different stellar environments. Methanol and hydrogen cyanide represent building blocks that survive for long periods under extreme conditions. The protective layer allowed these materials to remain intact until interacting with solar heat.

3I/Atlas does not indicate the existence of ready-made life, but brings together elements that support the idea that the basic ingredients of prebiotic chemistry are widely distributed throughout the cosmos. Sua hyperbolic trajectory and high speed confirm that it does not belong to Sistema Solar and came from another star system. Após passing through Júpiter, the comet heads into interstellar space, leaving data that enriches the understanding of the formation of icy bodies in other environments.

Observed behavior challenges conventional models

The object showed variations in color, significant gas emission and multiple visible structures during its activity. Essas characteristics require analyzes that consider differences between interstellar visitors and local comets. The study of 3I/Atlas contributes to models on how bodies of this type react when crossing different stellar systems.

Continued observations made it possible to map the production of specific molecules and their distribution in the coma. The comet remained active even at distances where many similar objects would remain inactive. Essa persistence reinforces its status as a cosmic capsule carrying information from a remote era of the galaxy.

Legacy of Passage includes data on molecule survival

3I/Atlas demonstrated that compounds associated with prebiotic processes can withstand billions of years of interstellar exposure beneath a hardened crust. The controlled release of these materials occurred only when thermal conditions changed with the approach to Sol. Essa dynamics offer clues about the preservation and transport of organic chemistry on a galactic scale.

After the encounter with Júpiter, the comet resumes its trajectory without major interactions with other planets on Sistema Solar. The records collected during their visit provide material for future comparisons with other interstellar objects. The event highlights the importance of monitoring these rare visitors to expand knowledge about the composition of distant star systems.