James Webb Space Telescope Reveals Interstellar Comet 3I/ATLAS Predates the Sun with Unusual Ice Composition

New observations from NASA's James Webb Space Telescope (JWST) of the interstellar comet 3I/ATLAS suggest it may have formed billions of years before our Sun. Scientists found its methane has a deuterium-to-hydrogen ratio 13 times higher than comet 67P/Churyumov-Gerasimenko, and its water ice grains are unusually mixed with dust, providing insights into the icy building blocks of other star systems.