Astronomers observing the interstellar comet 3I/ATLAS have detected record-breaking levels of methanol, a key organic molecule, revealing a chemical profile unlike anything previously seen in our solar system. Using high-resolution data from Atacama Large Millimeter/submillimeter Array, researchers found that methanol is not only exceptionally abundant but also spread throughout the comet’s coma, suggesting chemical processes that differ fundamentally from those of known comets.

In contrast, hydrogen cyanide appears to remain tightly bound to the nucleus, exposing an unexpected internal chemical diversity within the object. Together, these findings challenge existing models of comet formation and imply that environments beyond the Sun can produce rich and complex organic chemistry, raising the possibility that interstellar objects like 3I/ATLAS may carry important clues about how organic molecules form and evolve across the galaxy.