Jupiter

Jupiter has at least 63 moons! (and more are being discovered all the time)

These include the 4 main moons called Lo, Europa, Ganymede and Callista. These are referred to as the Galilean Moons because they were first discovered by Galileo Galilie in 1610

The names of the fours moons come from the lovers of Zeus from Greek mythology.

Here is a picture to show the scale of the moons of Jupiter and other planets.

Lo

Is the inner most of the four largest moons. It has over 400 actvive volcanoes and is the most geologically active object in the solar system. It has mountains that are taller than Mount Everest!

Europa

Europa is only slightly smaller than our moon. It is one of the smoothest objects in the solar system due to the layer of ice on the surface. Below this ice is about 100 kilometers of water which is exciting because this could be a good place to find extraterrestrial life ! Aliens !

Life in this Ocean could be similar to life found in Earths deep ocean were life is abundant even without natural light.

Ganymede

Ganymede is the largest natural satellite in the solar system. Its bigger than Mercury. It is also an ice covered moon. It is also the only natural satellite that has its own magnetic field.

Callisto

Is the last Galileon moon and is also the second largest of the four. Callisto has been considered the most suitable place for a human base for future exploration of the Jupiter system because it is furthest from the intense radiation of Jupiter.