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- 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 | 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 | 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 | 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 | Callisto – NASA Solar System Exploration
Formation Scientists think Callisto and Jupiter’s other satellites formed in the disk of materials left over from Jupiter’s formation Surface Callisto’s rocky, icy surface is the oldest and most heavily cratered in our solar system The surface is about 4 billion years old and it’s been pummeled, likely by comets and asteroids
- 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
- Galleries | Callisto – NASA Solar System Exploration
Jupiter's Moons: Family Portrait Callisto was revealed by the Voyager cameras to be a heavily cratered and hence geologically inactive world
- 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
- In Depth | Titan – NASA Solar System Exploration
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 This mammoth moon is the only moon in the solar system with a dense atmosphere, and it’s the only world besides Earth that has standing bodies of liquid, including rivers, lakes and seas, on its surface
- Callisto - NASA Solar System Exploration
Callisto and Jupiter’s three other largest moons were discovered in 1610 by Italian scientist Galileo Galilei Almost 400 years later , a spacecraft bearing his name —the Galileo orbiter—began the first in depth study of the Jovian system, including Callisto and its sister moons Galileo orbited Jupiter until the mission ended in 2003 Since then, several NASA spacecraft, including
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