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  • 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 | Io – NASA Solar System Exploration
    Jupiter's rocky moon Io is the most volcanically active world in the solar system, with hundreds of volcanoes, some erupting lava fountains dozens of miles (or kilometers) high Io’s remarkable activity is the result of a tug-of-war between Jupiter's powerful gravity and smaller but precisely timed pulls from two neighboring moons that orbit farther from Jupiter – Europa and Ganymede Size
  • 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 | Our Solar System – NASA Solar System Exploration
    The planetary system we call home is located in an outer spiral arm of the Milky Way galaxy Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids Beyond our own solar system, there
  • 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
  • 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)
  • In Depth | Callisto – NASA Solar System Exploration
    It takes the Jovian system—Jupiter and all of its moons—about 12 Earth years to complete one orbit of the Sun Structure Callisto has an icy surface covered by craters of various shapes and sizes, including bowl-shaped craters and craters with multiple rings
  • In Depth | Eirene – NASA Solar System Exploration
    The largest remaining chunk (still retaining 99% of the group's mass) was named "Carme," and the smaller pieces became the other 16 moons in the Carme group All of the Carme moons are retrograde, which means that they orbit Jupiter in the opposite direction from the planet's rotation
  • 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 | 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





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