What is the largest moon in the solar system?

Ganymede is the largest natural satellite of Jupiter and in the Solar System. It is also the only known moon having a magnetosphere. Actually, this natural satellite is 8% larger than Mercury, but it has only 45% of its mass. Ganymede's diameter is 2% larger than that of Titan, the largest moon of Saturn and the second-largest natural satellite of the whole Solar System. By the way, Titan is a moon which has a dense atmosphere, and that is also unique for our planetary system.

Ganymede

More Info: https://en.wikipedia.org/wiki/Ganymede_(moon)

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39 Comments

Howard Groopman

Almost went with Titan, but on "Jeopardy" the other night I learned that one is #2.

Robert Oldenburg

Thanks to second chance I knew it was one of two

Elsy O. Stromberg

LarryLane0415, Sounds like you'd be better off without it.

Elsy O. Stromberg

LarryLane0415, Why? Strange thing to say.

Nicholas Miernicki

Marian Spitzig, Yes!

Joseph A. Robitaille

Good question and answer.

Marian Spitzig

Definitely a repeated question.

Rob Farr

A good astronomy/science based trivia question and explanation.

Steve McVey

A moon, by definition, is a satellite of a planet, the sun is not a planet...

Steve McVey

I believe Earths moon is the largest moon in size relative to its planet, maybe this fact caused some confusion - on the other hand, there are more than a fair share of numptys visit this site.