Artist’s Impression of Ganymede (IMAGE) ESA/Hubble Information Centre Caption This image presents an artist’s impression of Jupiter’s moon Ganymede. Astronomers have used archival datasets from the NASA/ESA Hubble Space Telescope to reveal the first evidence for water vapour in the atmosphere of Jupiter’s moon Ganymede, the result of the thermal escape of water vapour from the moon’s icy surface. Credit ESA/Hubble, M. Garlick Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.