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The speckled object depicted here is Callisto, Jupiter’s second largest moon. This image was taken in May 2001 by NASA’s Galileo spacecraft, which studied Jupiter and its moons from 1995 until 2003.

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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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NASA’s Juno Spacecraft will arrive at Jupiter in the next few day after nearly five years in space. While it’s purpose is primarily to study Jupiter’s origins, interior structure, deep atmosphere and magnetosphere, it’s worth remembering Jupiter is also host to the largest and some of the most interesting moons in the solar system. Lets …

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Ganymede... Jupiter's largest moon, and for that matter, it is the largest moon in the Solar System. It is slightly larger than the planet, Mercury. Ganymede orbits Jupiter about once every week.

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An entry from I never will speak word.

"i want to know how. why. i want to discover the secrets of the universe and i want to *believe*."

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http://www.nightskyobserver.com/jupiter/is-there-a-subsurface-ocean-on-jupiters-largest-moon-ganymede/ Is There A Subsurface Ocean on Jupiter's Largest Moon Ganymede?