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  • 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 | Ganymede – NASA Solar System Exploration
    In Depth Jupiter’s moon Ganymede is proving to be a fascinating world Not only is it the largest moon in our solar system, bigger than the planet Mercury and the dwarf planet Pluto, but NASA’s Hubble Space Telescope has found the best evidence yet for an underground saltwater ocean on Ganymede
  • 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 | Callisto – NASA Solar System Exploration
    Callisto is Jupiter’s second largest moon and the third largest moon in our solar system It’s about the same size as Mercury In the past, some scientists thought of Callisto as a boring “ugly duckling moon” and a “hunk of rock and ice ” That’s because the crater-covered world didn’t seem to have much going on—no active volcanoes or shifting tectonic plates But data from
  • 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 | Earths Moon – NASA Solar System Exploration
    The brightest and largest object in our night sky, the Moon makes Earth a more livable planet by moderating our home planet's wobble on its axis, leading to a relatively stable climate It also causes tides, creating a rhythm that has guided humans for thousands of years The Moon was likely formed after a Mars-sized body collided with Earth several billion years ago Earth's Moon is the only
  • In Depth | Metis – NASA Solar System Exploration
    Discovery Metis was discovered in March 1979 by the Voyager science team Overview 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
  • Europa By the Numbers – NASA Solar System Exploration
    Europa is one of the largest of Jupiter’s more than 90 moons It's the sixth-closest moon to the planet


















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