Jupiter
Io is one of Jupiter's satellite (equivalent to our moon).
The fictional planet Tralfamadore is the moon of a large planet called Tran.
A small planet going round a big planet is called a moon. Like our moon, it is smaller than Earth - so all planets orbiting round a bigger planet is called a moon.
The planet is Saturn.
A natural satellite that orbits a planet is a moon
Pieces of rock that strike the surface of a moon or planet are called meteorites.
A moon? I don't think a planet orbiting another planet would be called a planet.
A moon
A moon.
This is Neptunes largest moon.
jupiter moon called IO
Triton is the largest moon of Neptune.