Ganymede    

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Context

• For the first time, astronomers have uncovered evidence of water vapor in the atmosphere of Jupiter's moon Ganymede.
• This water vapor forms when ice from the moon's surface sublimates - that is, turns from solid to gas.

Details

• Previous research has offered circumstantial evidence that Ganymede, the largest moon in the solar system, contains more water than all of Earth's oceans.
• However, temperatures there are so cold that water on the surface is frozen solid.
• Ganymede's ocean would reside roughly 100 miles below the crust; therefore, the water vapor would not represent the evaporation of this ocean.

https://www.sciencedaily.com/releases/2021/07/210726132125.htm