Hubble observations reveal ocean on Ganymede

March 13, 2015 9:54 PM

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Scientists using the Hubble Space Telescope have found the best evidence yet of a salty ocean of liquid water lurking beneath the surface of Jupiter’s largest moon Ganymede, ripening the icy world’s allure as mission planners design probes for more detailed exploration.

Long thought to possess an underground ocean, Ganymede is the largest moon in the solar system and measures bigger than Mercury.

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