Oldest Comet? Mystery Interstellar Object Found
Interstellar Visitor 3I/Atlas: A Cosmic Time Capsule Older Then Our Solar System?
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Oxford astronomers Uncover Potentially Ancient Interstellar Object
Astronomers from the University of Oxford have presented groundbreaking preliminary findings suggesting that a newly discovered object, designated 3I/Atlas, could be a staggering three billion years older than our own solar system. This remarkable discovery marks only the third time an object originating from beyond our solar system has been detected, offering an unprecedented glimpse into the universe’s ancient past.
The exciting preliminary findings were unveiled on Friday at the national meeting of the UK’s Royal Astronomical Society in Durham.
A Remarkable Interstellar visitor
“We’re all very excited by 3I/Atlas,” shared Matthew Hopkins, an astronomer at the University of Oxford who had recently completed his PhD studies when the object was first identified. He elaborated that the object could potentially be more than seven billion years old, positioning it as perhaps the most significant interstellar visitor encountered to date.
3I/Atlas was initially spotted on July 1, 2025, by the ATLAS survey telescope located in Chile. At the time of its discovery, it was approximately 670 million kilometers from the Sun. Since then, astronomers worldwide have been diligently working to chart its trajectory and gather more detailed facts about its composition and origin.
Tracing its Galactic Origins
Mr. Hopkins hypothesizes that 3I/atlas likely originated from the Milky Way’s ‘thick disk.’ This region is characterized by a population of ancient stars that orbit the galactic center on paths that extend above and below the plane where our Sun and the majority of other stars reside.
The research team’s analysis suggests that as 3I/ATLAS probably formed around an ancient star, it is indeed likely composed of a significant amount of water ice. As the object approaches the Sun later this year, the solar energy is expected to heat its surface, causing the ice to sublimate and release vapor and dust. This process could, in turn, create a visible glowing tail, a characteristic often seen in comets.
A Glimpse into the Deep Past
The researchers’ conclusions were drawn from a sophisticated model developed by Mr. Hopkins. Professor Chris Lintott, a co-author of the study, expressed the profound implications of the discovery: “This is an object from a part of the galaxy we’ve never seen up close before. We think there’s a two-thirds chance this comet is older than the solar system, and that it’s been drifting through interstellar space ever as.”
For those eager to witness this cosmic traveler, 3I/ATLAS is expected to be visible from Earth later this year, potentially observable even with amateur telescopes.
Prior to the detection of 3I/Atlas, only two other interstellar objects had been identified: 1I/’Oumuamua, discovered in 2017, and 2I/borisov, found in 2019.
The astronomical community is abuzz with anticipation as a new, exceptionally powerful telescope in Chile, the vera C. Rubin Observatory, prepares for its full operational survey of the southern night sky later this year. Scientists anticipate that this advanced instrument could lead to the discovery of between five and fifty new interstellar objects, further expanding our understanding of the vast and ancient universe.