|Only moon of Earth, first and only moon visited by humans.
|Most volcanically active body in the solar system.
|Only moon in the solar system with a substantial atmosphere.
|Largest moon in the solar system.
|Most heavily cratered object in the solar system.
|Orbits Neptune in the opposite direction of the planet’s rotation.
|Largest moon of Uranus.
|Pluto (Dwarf Planet)
|So big compared to Pluto that they are sometimes considered a double dwarf planet.