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  • 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 | 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 | Europa – NASA Solar System Exploration
    Decades ago, science fiction offered a hypothetical scenario: What if alien life were thriving in an ocean beneath the icy surface of Jupiter’s moon Europa? The notion pulled Europa out of obscurity and into the limelight where it has remained, stoking the imaginations of people both within and outside the science community who fantasize about humans discovering life beyond Earth That
  • In Depth | Callisto – NASA Solar System Exploration
    In Depth 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 ”
  • In Depth | Io – NASA Solar System Exploration
    In Depth 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
  • In Depth | Earths Moon – NASA Solar System Exploration
    Earth's only natural satellite is simply called "the Moon" because people didn't know other moons existed until Galileo Galilei discovered four moons orbiting Jupiter in 1610
  • 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
  • In Depth | Titan – NASA Solar System Exploration
    In Depth Saturn's largest moon, Titan, is an icy world whose surface is completely obscured by a golden hazy atmosphere Titan is the second largest moon in our solar system Only Jupiter's moon Ganymede is larger, by just 2 percent Titan is bigger than Earth's moon, and larger than even the planet Mercury


















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