Interstellar visitor 3I/ATLAS as captured during recent observations.
Credit : X -SpaceTracker.space
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Interstellar visitor 3I/ATLAS is once again making headlines – and getting scientists talking. Months after its discovery, this mysterious object from beyond our solar system continues to surprise researchers, who now believe its surface may be dotted with erupting “ice volcanoes”, a phenomenon seldom observed at this scale.
Earlier this year, 3I/ATLAS reached its perihelion – the point in its journey closest to the Sun. As it warmed, astronomers watched as huge quantities of ice and dust burst into space, creating spectacular jets that streamed behind the object like a classic comet tail. Even more curious was the appearance of an “anti-tail”, a plume of material pointing directly towards the Sun, defying the usual patterns seen in comets.
The extreme activity has led scientists to suspect something far more dramatic than simple solar heating: a form of cryovolcanism, where frozen gases erupt in violent releases similar to volcanoes – but made of ice rather than lava.
Signs of cryovolcanic eruptions on a visitor from another star system
A research team led by Spanish scientist Josep Trigo-Rodríguez at the Institute of Space Sciences studied the object closely using images captured by the Joan Oró Telescope at the Montsec Observatory in late October, during the peak of 3I/ATLAS’s activity.
“We were all surprised,” Trigo-Rodríguez told Live Science. “For a comet that probably formed in a completely different planetary system, it’s remarkable how similar its surface materials appear to those found in objects beyond Neptune in our own solar system.”
These distant bodies – known as trans-Neptunian objects – frequently display cryovolcanoes, driven by internal heat sources that force frozen gases to sublimate and blast outward. The team believes the same process may be unfolding on 3I/ATLAS.
According to their analysis, carbon dioxide ice trapped beneath the surface may be reacting with minerals such as nickel and iron sulphides inside the object’s core. This chemical interaction could generate the internal energy needed to power ice eruptions, sending jets of vapour and debris streaming into space.
Still many mysteries about 3I/ATLAS
Despite the dramatic images, much about the object remains unknown. Even its size is still up for debate. Current estimates range widely, suggesting the nucleus could measure anything from roughly 1,400 feet to an incredible 3.5 miles across.
What makes 3I/ATLAS so scientifically valuable is its origin – it did not form near our Sun but in a completely different star system before drifting into ours. This makes it a rare, natural time capsule from across the galaxy, carrying clues about how planets and small bodies form under different cosmic conditions.
Astronomers are eager to make the most of this opportunity. 3I/ATLAS is expected to reach its closest point to Earth later this month, offering researchers another chance to gather more precise observations before the object continues deeper into the solar system and sweeps past Jupiter in March 2026.
Why scientists are watching so closely
Interstellar visitors remain incredibly rare, and each new discovery forces scientists to rethink long-held assumptions about how planetary systems evolve. According to Trigo-Rodríguez and his colleagues, every object like 3I/ATLAS seems to behave differently, introducing new puzzles that challenge existing theories.
“Interstellar objects continue to expand our understanding of how planetary systems form and how their chemical building blocks change over time,” the team noted. “Each new visitor reveals unexpected properties that test our models.”
The researchers also point towards the future of space exploration. Dedicated “intercept missions” capable of reaching and sampling these passing visitors could one day allow scientists to study real material from other star systems directly – a step that would take planetary science into truly uncharted territory.
For now, however, 3I/ATLAS remains a distant but dazzling mystery, its shimmering jets and suspected ice volcanoes reminding scientists – and skywatchers alike – that some of the universe’s greatest surprises can arrive without warning, straight from the depths of interstellar space.
