Ganymede
Phobos is the biggest moon of Mars.
No, because it is the biggest planet and has the biggest moon.
Titan
earth has but one moon
the sun is the biggest, then earth and moon is the smallest
Universe: It contains everything.
In short it's the Sun but you probably didn't mean that. A dwarf planet like Pluto is among the biggest, or perhaps Saturn's moon Titan.
round, gravity and the lunar paths of moons make them round
The biggest moon is "Ganymede" which is a moon of Jupiter.
Phobos is the biggest moon of Mars.
Jupiters biggest moon is Ganymede
the biggest moon is gaymede
Titan is the biggest moon of saturn and the second biggest in the solar system
Ganymede is the biggest moon and orbits jupiter.
sun moon and earthBetween the Sun, Moon and the Earth, the Sun is the biggest.
The fourth biggest moon in our Solar System is Io a moon of Jupiter. See related question.
The moon does not change in size