Astronomers are on high alert after interstellar comet 3I\/ATLAS streaked into the Solar System, unleashing a surge of energy and gas unlike anything seen before.<\/p>\n
Travelling at over 200,000 km\/h, the alien object\u2014the third confirmed visitor from another star system\u2014has stunned scientists with its carbon dioxide-rich emissions, deep-space chemistry, and hyperbolic path that ensures it will never return.<\/p>\n
Observations from NASA and the James Webb Space Telescope suggest the comet’s makeup could rewrite how planets form around distant suns.<\/p>\n
Only the third confirmed interstellar visitor after \u02bbOumuamua and Borisov, 3I\/ATLAS may contain pristine material older than the Sun itself, offering a rare glimpse into the birthplaces of other worlds.<\/p>\n
A Rare Visitor from Beyond the Solar System<\/p>\n
The object, officially designated 3I\/ATLAS, was discovered on July 1, 2025, by the Asteroid Terrestrial-impact Last Alert System (ATLAS) survey.<\/p>\n
It is only the third confirmed interstellar object to pass through the solar system<\/a>, following \u02bbOumuamua in 2017 and 2I\/Borisov in 2019, according to NASA.<\/p>\n Scientists said 3I\/ATLAS behaves essentially like a comet–a frozen body of gas and dust likely expelled from another star system–but some of its recent activity has surprised them.<\/p>\n NASA reported that 3I\/ATLAS is travelling at more than 209,000 kilometres per hour (130,000 mph) as it approaches its closest point to the Sun<\/a>, or perihelion, on October 29. At that point, it will pass about 200 million kilometres (126 million miles) from the Sun, according to Space.com.<\/p>\n Scientists Detect Sudden Energy Burst<\/p>\n In recent weeks, space telescopes and ground-based instruments detected a sharp rise in the object’s emissions, including intense releases of gas and dust.<\/p>\n Data from the James Webb Space Telescope (JWST) showed an unusually high ratio of carbon dioxide (CO\u2082) to water vapour (H\u2082O), with CO\u2082 dominating the object’s coma–the gaseous envelope surrounding its nucleus–more strongly than in any previously studied comet.<\/p>\n A preprint study on arXiv.org noted that this composition ‘may indicate that 3I\/ATLAS contains ices exposed to higher levels of radiation<\/a> than solar-system comets, or that it formed close to the CO\u2082 ice line in its parent disk.’<\/p>\n Further analysis by the Hubble Space Telescope suggested that 3I\/ATLAS’s nucleus could be between 300 meters and 5.6 kilometres wide. However, the comet’s heavy outgassing complicates precise estimates, NASA said in a mission update<\/a>.<\/p>\n ‘Communicative’ or Just Unusual?<\/p>\n The burst of energy and complex emission patterns led some commentators to wonder whether the object could be ‘sending signals.’<\/p>\n A Futurism report highlighted its ‘anti-tail’ \u2014 a structure pointing toward the Sun rather than away from it \u2014 and its apparent precision trajectory, calling the phenomenon ‘strikingly atypical<\/a>.’<\/p>\n Harvard astrophysicist Avi Loeb, who previously speculated that \u02bbOumuamua might have been artificial, told the New York Post that 3I\/ATLAS’s unusual light emissions ‘deserve further scrutiny<\/a>‘ because ‘natural explanations are not yet fully satisfactory.’<\/p>\n However, most researchers caution against such interpretations. In a statement to The Guardian, a NASA spokesperson dismissed claims of alien origin, stating there is ‘no evidence of intelligence<\/a>‘ behind the outbursts and that the object’s activity remains consistent with natural processes.<\/p>\n ‘Even comets in our solar system can brighten suddenly if a pocket of ice sublimates and drives off dust,’ the agency said.<\/p>\n Strange Chemistry and Metal Emissions<\/p>\n Beyond the energy burst, spectroscopic data revealed traces of nickel and cyanide<\/a>–rare elements in most comets–along with a bright anti-tail visible through the Keck II telescope in Hawaii, according to Futurism.<\/p>\n Researchers using the Transiting Exoplanet Survey Satellite (TESS) also found that the comet began outgassing<\/a> while still about 6.4 astronomical units (roughly 960 million kilometres) from the Sun, well beyond the range where solar heating typically triggers sublimation, according to another arXiv study.<\/p>\n What Happens Next<\/p>\n