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What are the Largest Moons in the Solar System?

You'll be surprised to hear that the largest moon in the Solar system is not the Moon that orbits Earth. The largest moon in the solar system is Ganymede which orbits Jupiter, the fifth planet from the Sun.. Ganymede's radius is 2,631.2 km which is larger than our Moon which is 1737.5 km. In comparison, the Earth's radius is 6,371km so roughly it is a third the size of our planet.

Our Moon is the largest in comparison to the planet it orbits. Ganymede when compared to the Jupiter which is 69,911km, it is considerably much smaller comparably than our moon. Below are some moon facts of other planets.

Top 20 Largest Moons in the Solar System, Largest First


PositionMoonRadius (km)PlanetPlanet Equatorial Radius
1Ganymede2631.20Jupiter71492.00
2Titan2574.70Saturn60268.00
3Callisto2410.30Jupiter71492.00
4IO1821.60Jupiter71492.00
5Moon1737.50Earth6378.10
6Europa1560.80Jupiter71492.00
7Triton1353.40Neptune24764.00
8Titania788.90Uranus25559.00
9Rhea764.30Saturn60268.00
10Oberon761.40Uranus25559.00
11Iapetus735.60Saturn60268.00
12Charon603.60Pluto1195.00
13Umbriel584.70Uranus25559.00
14Ariel578.90Uranus25559.00
15Dione561.70Saturn60268.00
16Tethys533.00Saturn60268.00
17Enceladus252.10Saturn60268.00
18Proteus210.00Neptune24764.00
19Nereid170.00Neptune24764.00
20Hyperion135.00Saturn60268.00

As for what is the largest moon in the galaxy. We've not got many contenders outside the solar system so we can't answer that yet. As for the universe, we could never know what is the largest moon in the universe as we could never see and measure every moon around every planet around every star in every galaxy. You could say at the moment, the largest moon we know of in the galaxy and the universe is Ganymede.


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