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  1. Moons of Jupiter. A montage of Jupiter and its four largest moons (distance and sizes not to scale) There are 95 moons of Jupiter with confirmed orbits as of 5 February 2024. [1] [note 1] This number does not include a number of meter-sized moonlets thought to be shed from the inner moons, nor hundreds of possible kilometer-sized outer ...

  2. Jupiter's four largest moons were the first moons discovered beyond Earth. They are called the Galilean satellites after Italian astronomer Galileo Galilei, who is credited with their discovery in 1610. German astronomer Simon Marius observed them around the same time, but is largely forgotten because he published his findings after Galileo.

  3. Jupiter is the largest planet in the solar system and has, as of 2023, 95 known moons. The four largest moons of Jupiter—Io, Callisto, Ganymede, and Europa—were the first objects in the solar system discovered with a telescope. Galileo discovered them in 1610, and they are now called the Galilean satellites.

    • The Editors of Encyclopaedia Britannica
  4. Aug 21, 2023 · Galileo Galilei spotted the first Jupiter moons in 1610 with a new invention called a telescope. German astronomer Simon Marius found Jupiter's moons about the same time as Galileo, but Galileo was first to report the moons and is credited with their discovery. Modern astronomer Scott S. Sheppard has discovered the most moons of Jupiter ...

  5. Jun 8, 2023 · Jupiter's second-largest moon Callisto is the third-largest moon in the solar system. The moon's surface is thought to be about 4 billion years old , making it the oldest icy surface in the solar ...

  6. Learn about Jupiter, the largest and oldest planet in our solar system, and its 95 moons, including the potential life-bearing Europa. Discover how Jupiter's rings, atmosphere, and magnetic field were formed and how they compare to other planets.

  7. science.nasa.gov › jupiter › moonsIo - NASA Science

    Io is the most volcanically active world in the solar system, with hundreds of volcanoes and lava lakes. Learn about its history, features, and exploration by NASA spacecraft.

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