In the vast, silent corridors of our solar system, a visitor from the deep galactic past is currently rewriting the rules of cosmic chemistry. When the interstellar object 3I/ATLAS first flickered into view on July 1, 2025, it was greeted with a mixture of professional relief and scientific curiosity. Here, at last, seemed to be a 'known quantity' — a third interloper from beyond our sun that appeared to behave exactly like the icy wanderers we have studied for centuries.
But as 3I/ATLAS speeds toward its meeting with Jupiter in March 2026, the simple story of a 'dirty snowball' is starting to fall apart. The James Webb Space Telescope (JWST) used spectroscopy to find an unusual amount of tholins and complex amino acids in the object's nucleus. These are the building blocks of proteins on Earth.
