Forecast for Jupiter's Moon Ganymede: Extremely Cold and... Humid?

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Forecast for Jupiter's Moon Ganymede: Extremely Cold and... Humid?
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Forecast for Jupiter's Moon Ganymede: Extremely Cold and... Humid?

Using a combination of old and new data from Hubble Space Telescope, astronomers have found water vapor in the atmosphere of Jupiter’s planet-sized moon Ganymede!