Algodoo

Left To Right: Jupiter Io Europa Ganymede And Callisto
Here’s Some Facts About Each Moon:
Io: The Moon With The Most Volcanos!
Europa: This Moon May Have an Ocean Under Its Thick Layer Of Ice!
Ganymede: This Is The Biggest Moon In Our Solar System, It Is Even Bigger Then Mercury!
Callisto: White Spots Covering The Moon!
These Moons Were Discovered In 1610!