Galilean moons - Wikipedia
The Galilean moons (/ ˌɡælɪˈleɪ.ən /), [1] or Galilean satellites, are the four largest moons of Jupiter: Io, Europa, Ganymede, and Callisto.
Ganymede (moon) - Wikipedia
Ganymede orbits Jupiter in roughly seven days and is in a 1:2:4 orbital resonance with the moons Europa and Io, respectively. Ganymede is composed of silicate rock and water in approximately equal proportions.
Io, Europa, Ganymede and Callisto - SciTechDaily
May 28, 2020 · Though they are all of similar sizes—about one-fourth of Earth’s radius—the four moons are diverse: Io is violently volcanic, Europa is encrusted in ice, Ganymede has a magnetic field, and Callisto is pockmarked with ancient craters.
What are Jupiter’s Galilean moons? | The Planetary Society
Dec 26, 2023 · Io, Europa, Ganymede, and Callisto are collectively the Galilean moons. Their name comes from the Italian astronomer Galileo Galilei, who first observed these four moons through a telescope in 1610.
Moons of Jupiter - Wikipedia
The most massive of the moons are the four Galilean moons: Io, Europa, Ganymede, and Callisto, which were independently discovered in 1610 by Galileo Galilei and Simon Marius and were the first objects found to orbit a body that was neither Earth nor the Sun.
Ganymede: Facts - Science@NASA
Nov 5, 2021 · Ganymede orbits the Sun along with Jupiter and its other satellites every 12 Earth years. Ganymede, Io, and Europa are in what is called a resonance – every time Ganymede orbits Jupiter once, Europa orbits twice, and Io orbits four times. This pattern in their orbits is called orbital resonance.
Moons of Jupiter | Table, Names, Sizes, & List | Britannica
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 …
Ganymede: Exploration - Science@NASA
The discovery of Ganymede and Jupiter’s three other largest moons – Europa, Io, and Callisto – forever changed the way we view our solar system. On Jan. 7, 1610, Italian astronomer Galileo Galilei was looking at Jupiter through his homemade telescope when he spotted what he thought were three small, bright stars near Jupiter.
The Galilean Moons of Jupiter The Galilean Moons of Jupiter
Ganymede, Europa and Io are all in orbital resonance with Jupiter. Io completes exactly four orbits and Europa completes exactly two orbits in the same time it takes Ganymede to complete one orbit around Jupiter.
The Galilean moons of Jupiter and how to observe them
Apr 13, 2023 · The origins of Jupiter's Galilean moons is a long-standing mystery. But new research suggests a promising pathway for how they may have formed. From bottom to top is Io, Europa, Ganymede, and...