For the first time, scientists have discovered the first-ever evidence of water vapor on Jupiter's largest moon, Ganymede.
This water vapor forms when ice from the moon's surface sublimates or turns from solid to gas. Scientists have used new and archival datasets from NASA's Hubble Space Telescope to make the discovery.
According to reports, there were pieces of evidence retrieved from the previous research that said Ganymede contains more water than all of Earth's oceans. But, due to low temperatures, water on the surface would freeze.
The water vapor would not represent the evaporation of Ganymede's ocean as it would reside roughly 100 miles below the crust.
For the past two decades, the astronomers have re-examined Hubble's observations to find this evidence of water vapor.
The first ultraviolet (UV) images of Ganymede was taken by Hubble's Space Telescope Imaging Spectrograph in 1998, which revealed colorful ribbons of electrified gas called auroral bands and provided further evidence that Ganymede has a weak magnetic field.