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Ganymede (5,262 km), a moon of Jupiter and the largest moon in the Solar System (larger even than Mercury)

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Jupiter Moons - Callisto discovered by Galileo Galilei in 1610 using a telescope. It is thought to have oceans of liquid water beneath its crust. about the size of Mercury, is the 3rd largest moon in the solar system. It is more heavily cratered than any other moon in the solar system. Callisto remains as it was when it formed, during the period of intense meteoroid bombardment that the entire solar system experienced

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Jupiter has 64 moons, and from top to bottom, the moons shown are Io, Europa, Ganymede and Callisto.

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The four largest and best known of Jupiter's 60+ moons. I can see these through my telescope!!! ❤️

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NASA discovers an underground ocean on Jupiter’s largest moon

This cross-sectional illustration shows the interior of Jupiter's largest moon Ganymede, based on theoretical models, in-situ observations by NASA's Galileo orbiter, and Hubble Space Telescope observations of the moon’s magnetosphere. Image released March

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Jupiter's moons Three of Jupiter's largest moons are seen moving across the banded face of Jupiter in these images from NASA's Hubble Space Telescope taken on Jan. 24, 2015, and released on Feb. 5, 2015. Jupiter's four largest moons can commonly be seen transiting the face of the giant planet and casting shadows onto its cloud tops. However, seeing three moons transiting the face of Jupiter at the same time is rare, occurring only once or twice a decade, according to a NASA news…

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Europa, a moon of Jupiter, appears as a thick crescent in this enhanced-color image from NASAs Galileo spacecraft. - Credit: NASA/JPL/University of Arizona

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