The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto. They were discovered by Galileo Galilei around January 1610 and were the first group of objects found to orbit another planet. Their names derive from the lovers of Zeus.

 Mnemonic:
I Eat Green Cows

 Mnemonic:
I Enjoy Grated Cheese