What is the Largest Satellite in the Solar System?

The absolute largest natural satellite (moon) in the entire massive Solar System is Ganymede.

• Who does it orbit?: It heavily orbits the massive gas giant planet, Jupiter.
• Massive Size: Ganymede is unbelievably massive. It has a physical heavy diameter of 5,268 kilometers. It is so violently huge that it is physically larger than the entire massive planet Mercury and the heavy dwarf planet Pluto.

• Magnetic Field: Ganymede is the absolutely ONLY massive moon in the entire solar system to mathematically possess its own violently active, heavy magnetic field (just like Earth), creating massive glowing auroras at its poles.
• Hidden Ocean: Massive scientists using heavy space telescopes strongly believe that violently trapped deep beneath Ganymede's massive 100-mile-thick icy crust lies a gigantic, heavy, pitch-black massive ocean of liquid saltwater.

The absolute second-largest massive moon in the solar system is Titan, which heavily orbits the massive ringed planet Saturn.

• Titan is highly famous because it is the absolutely ONLY massive moon to have a violently thick, heavy atmosphere (made of heavy nitrogen), and it literally violently rains liquid methane gas on its massive surface.