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  • In Depth | Adrastea – NASA Solar System Exploration
    Discovery Adrastea was discovered in July 1979 by the Voyager science team In Depth Orbiting within Io's orbit, which is the innermost of the four largest moons of Jupiter (called the Galilean moons), are four smaller moons named Metis, Adrastea, Amalthea, and Thebe All the moons within this grouping are oddly shaped, lacking either the mass and or fluidity of composition to pull themselves
  • In Depth | Ganymede – NASA Solar System Exploration
    Formation Ganymede and Jupiter’s other large moons (Io, Europa, and Callisto) likely formed from leftover material after Jupiter condensed out of the initial cloud of gas and dust surrounding the Sun, early in the history of our solar system Ganymede is likely about the same age as the rest of the solar system – about 4 5 billion years old
  • In Depth | Moons – NASA Solar System Exploration
    Earth's Moon Martian Moons Phobos and Deimos Moons of the Giant Planets Jupiter's menagerie of moons includes the largest in the solar system (Ganymede), an ocean moon (Europa) and a volcanic moon (Io) Many of Jupiter's outer moons have highly elliptical orbits and orbit backwards (opposite to the spin of the planet)
  • Planet Compare - NASA Solar System Exploration
    NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
  • In Depth | Jupiter Moons – NASA Solar System Exploration
    NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
  • In Depth | Harpalyke – NASA Solar System Exploration
    It is colored a similar gray to two other moons in the Ananke family: Praxidike and Iocaste At a mean distance of about 13 1 million miles (21 1 million kilometers) from Jupiter, Harpalyke takes about 623 Earth days to complete one orbit How Harpalyke Got its Name
  • In Depth | Himalia – NASA Solar System Exploration
    How Himalia Got its Name Himalia was named for a nymph of the island of Rhodes in Greek mythology who was one of the lovers of Zeus (the Greek equivalent of the Roman god Jupiter) She bore him three sons: Spartaeus, Cronios and Cytus
  • In Depth | Lysithea – NASA Solar System Exploration
    At the appropriate time, Zeus undid the stitches and out popped Dionysus A name ending in "a" was chosen for this moon in keeping with the International Astronomical Union's policy for designating Jupiter's outer moons which have prograde orbits (orbiting in the same direction as Jupiter's rotation)
  • Callisto - NASA Solar System Exploration
    Callisto and Jupiter’s three other largest moons were discovered in 1610 by Italian scientist Galileo Galilei Almost 400 years later , a spacecraft bearing his name —the Galileo orbiter—began the first in depth study of the Jovian system, including Callisto and its sister moons Galileo orbited Jupiter until the mission ended in 2003 Since then, several NASA spacecraft, including
  • In Depth | Europa – NASA Solar System Exploration
    Formation Jupiter’s large Galilean moons – Io, Europa, Ganymede, and Callisto – likely formed out of leftover material after Jupiter condensed from the initial cloud of gas and dust surrounding the sun, early in the history of the solar system





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