How many moons Jupiter has, what are the names and sizes of these in comparison of earth?

Answer 1

Jupiter have 67 known moons which make Jupiter the largest number of moons our Solar System.

These are the four Galilean moons, which are comparable in size to the Moon. The four inner moons are much smaller, the fourth most massive being more than 7000 times more massive than the fifth-most. Check this List Moons of Jupiter's