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Interstellar invader Comet 3I/ATLAS is filled with water ice that may very well be older than Earth

July 23, 2025
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Interstellar invader Comet 3I/ATLAS is filled with water ice that may very well be older than Earth
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A workforce of scientists has discovered the lately found “interstellar invader” comet 3I/ATLAS is teeming with water ice. This water may have been sealed within the comet for 7 billion years, which might make it older than the photo voltaic system itself.

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The workforce additionally discovered a mix of natural molecules, silicates and carbon based mostly minerals on the article, that means 3I/ATLAS resembles asteroids discovered on the outskirts of the photo voltaic system’s primary asteroid belt between Mars and Jupiter.

The workforce’s observations, made with the SpeX instrument on the NASA Infrared Telescope Facility (IRTF), perched upon the mountain Mauna Kea in Hawaii, and the Gemini Multi-Object Spectrograph geared up on the Gemini South Telescope in Chile.


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Found on July 1 by the ATLAS survey telescope, 3I/ATLAS is simply the third object astronomers have found passing by means of the photo voltaic system from exterior its boundaries.

The earlier two interstellar our bodies found within the photo voltaic system have been the cigar-shaped 1I/’Oumuamua, seen in 2017, and the seeming asteroid/comet hybrid 2I/Borisov, detected two years later in 2019.

Some scientists estimate there may very well be as many as 1 million interstellar guests within the photo voltaic system at anybody time. It is thought that many of those may lurk within the Oort cloud, a shell of comets positioned on the very fringe of the photo voltaic system. The research of 3I/ATLAS and different interstellar interlopers may reveal what situations are like in different planetary techniques.

“3I/ATLAS is an lively comet. It clearly reveals a coma and sure accommodates a major quantity of water ice,” Bin Yang, the chief of this new analysis and a scientist on the Universidad Diego Portales, advised Area.com. “Its bodily exercise confirms its classification as a comet. Essentially the most thrilling discovering was the presence of water ice options within the coma.”

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gif animation showing 3I/ATLAS traveling through a background of stars.

The doubtless 7 billion 12 months outdated interstellar comet 3I/ATLAS touring by means of a background of stars. (Picture credit score: ESA)

Comas are the nebulous envelopes of gasoline and mud that encompass comets. This materials has been expelled from inside a comet’s nucleus — meaning analyzing it with a way referred to as spectroscopy can inform astronomers what the rock and ice of that comet consists of.

“We obtained seen and near-infrared spectra of 3I/ATLAS because it approached the solar,” Yang stated. “Nonetheless, no gasoline emissions have been detected.”

Yang and colleagues discovered that whereas 3I/ATLAS is undoubtedly a comet, a few of its spectroscopic traits and its mud composition resemble D-type asteroids. These are our bodies from the principle asteroid belt with natural molecule-rich silicates and carbon with water ice of their interiors.

“Its reflectance properties are most just like D-type asteroids and a few lively comets,” Yang stated. “The spectrum of 3I/ATLAS might be matched by a mix of Tagish Lake meteorite materials and water ice. This implies a mix of organics, silicates, carbonate minerals and a major quantity of water ice.”

A red circle is around a fuzzy white dot. There are other fuzzy streams all around.

A picture of the interstellar invader Comet 3I/ATLAS as seen by the Hubble Area Telescope. (Picture credit score: NASA/ ESA/Hubble)

This might additionally provide deeper perception into the evolution of the Milky Approach. That is as a result of separate analysis has used the trajectory of 3I/ATLAS to deduce that it comes from a area of our galaxy with stars that fashioned round 2.5 billion years previous to our 4.6 billion-year-old solar.

That provides 3I/ATLAS a potential age of seven billion years, which might make it the oldest comet humanity has ever seen.

“If the preliminary water ice detection is confirmed, it may certainly symbolize among the oldest and most pristine water ever noticed, fashioned in one other planetary system and preserved all through its interstellar journey,” Yang stated.

Yang emphasised that there’s but to be a direct detection of particular person compounds round 3I/ATLAS, with these outcomes representing an inferred composition.

“3I/ATLAS is barely the third confirmed interstellar object. Observing it close to perihelion [its closest approach to the sun gave us a rare opportunity to study how interstellar material behaves under solar heating, an exciting and scientifically valuable event,” Yang said. “The structure of water ice carries rich information about the object’s formation conditions.”

Yang and colleagues are now awaiting complementary data from other teams using large telescopes like the Very Large Telescope and the Keck Observatory.

“Our goal is to combine these spectra to confirm the ice detection and to search for gas emissions as the object approaches the sun,” Yang concluded.

Clearly, 3I/ATLAS is set to keep scientists busy for years to come.

A pre-peer-reviewed version of the team’s research appears on the paper repository arXiv.



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