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Hubble witnessed plumes of water vapor on which of Jupiter’s moons?

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Europa is an ice-covered moon long suspected to 
have an ocean under the ice, but Hubble detected  

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actually episodic plumes of water vapor being 
ejected from between cracks in the ice of Europa.

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That's very exciting, very unexpected. And 
that's something that we can glean by having  

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a telescope that can look at things in the 
solar system over time and see changes and  

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dynamics that gives us information that we 
would never get by just one single snapshot.

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So because Hubble is above the Earth's 
atmosphere we can actually see details on  

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planets in our solar system and beyond that would 
be difficult or impossible to see from the ground.

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