Astronomers discover exotic atmosphere on scorching hot exoplanet Cuancoá. ‘Like finding a snowball that hasn’t melted in a fire’ The James Webb Space Telescope has detected water vapor and thick clouds on LTT 9779 b, an ultra-hot Neptune locked in a blistering 19-hour orbit. Astrobitica March 20, 2025 (Last updated: March 20, 2025) 1 minute read The James Webb Space Telescope has detected water vapor and thick clouds on LTT 9779 b, an ultra-hot Neptune locked in a blistering 19-hour orbit. About the Author Astrobitica Administrator Visit Website View All Posts Post navigation Previous: Massive star explosions may have triggered two mass extinctions in Earth’s past: ‘It would be terrifying.’Next: Astro-challenge: Following Venus from dusk until dawn