Interstellar comet 3I/ATLAS' new discovery finds - how 3I/ATLAS bursting with methanol could reveal secrets of planet formation beyond our solar system

3I/ATLAS comet new discovery: When 3I/ATLAS entered our solar system, it brought with it more than just a fleeting glimpse of an interstellar traveler. Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile discovered that this comet is unusually rich in methanol, a simple alcohol molecule, a chemical clue that could shed light on how planets and icy bodies form around other stars, as per a report.

3I/ATLAS: ALMA Observations Reveal High Methanol Content

As the comet neared the sun, its icy surface warmed, releasing gas and dust that formed a glowing halo, or coma, around its core, as per a Space.com report. This allowed ALMA to capture detailed measurements of its chemical makeup. The findings show that methanol is far more abundant relative to hydrogen cyanide than in comets from our own solar system, suggesting that 3I/ATLAS formed in a planetary system with very different conditions, such as colder temperatures or a unique chemical mix.

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What 3I/ATLAS Tells Us About Planet Formation Around Other Stars

Nathan Roth, lead author of the study and a professor at American University, explained that, "Observing 3I/ATLAS is like taking a fingerprint from another solar system," adding, "The details reveal what it's made of, and it's bursting with methanol in a way we just don't usually see in comets in our own solar system," as quoted by Space.com.

Methanol is not uncommon in space, it forms on icy dust grains in interstellar clouds and is often incorporated into comets during planet formation. But the unusually high levels in 3I/ATLAS make it a valuable chemical fingerprint from another system, as per the Space.com report.

Tracking 3I/ATLAS With Hubble and James Webb Telescopes

3I/ATLAS, discovered in July 2025 by the Asteroid Terrestrial-impact Last Alert System (ATLAS), is only the third known interstellar object to visit our solar system, after ‘Oumuamua in 2017 and 2I/Borisov in 2019.

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How 3I/ATLAS’s Coma and Tail Form as It Approaches the Sun

Since its discovery, telescopes around the world, including the Hubble and James Webb Space Telescopes, have monitored the comet as it moves through the inner solar system, revealing a diffuse coma and faint dust tail formed by gas and dust escaping from its ices, as per the Space.com report.

Methanol vs. Hydrogen Cyanide: Unique Chemical Clues

ALMA observations also highlighted unique outgassing behavior. While hydrogen cyanide mostly streams directly from the nucleus, methanol is released both from the nucleus and from icy grains in the coma, acting like miniature comets themselves, the first time such behavior has been mapped in an interstellar object.

Understanding the Origins of 3I/ATLAS

Though some have speculated online that 3I/ATLAS could be artificial, its comet-like tail, gas jets, and molecular composition indicate it is a natural icy body, as per the Space.com report.

FAQs

What is 3I/ATLAS?

3I/ATLAS is an interstellar comet, the third known object from outside our solar system to pass through.



When was 3I/ATLAS discovered?

It was discovered in July 2025 by the Asteroid Terrestrial-impact Last Alert System (ATLAS).