Webb spotted a subtle difference in the interstellar comets ice
Astronomers caught something unusual about the ice of a comet that came from another star system. A Southwest Research Institute team pointed NASA 's James Webb Space Telescope at interstellar comet 3I/ATLAS three times between Aug. 2025 and April 2026, catching it before and after its closest pass by the sun. The space telescope spreads a comet's light into a rainbow, including infrared light tha…