Ganymede is the largest satellite in the solar system with a diameter of 5268 kilometers (3270 miles) and is located 389,776,239 miles from Earth. The satellite Ganymede is also one of the brightest satellites out of all of Jupiter's moons and satellites. It is larger than Mercury and Pluto, and three-quarters the size of Mars. Ganymede was discovered by Galileo in 1610. When scientists look at Ganymede's surface, they can safely predict that it's about 3 to 3.5 billion years old!
It is predicted that Ganymede has water because of its smooth appearance, although it is frozen and has a rocky core. Ganymede has three different layers: the core is made of iron and sulfur. The mantle is made of silicate. Ganymede's surface has two types of terrains. (A terrain is what the soil or ground is like.) Both of Ganymede's terrains have a little bit of craters and are icy. Half of Ganymede's surface is very old and has lots of cratered regions. This part of Ganymede is dark. The other side of Ganymede is younger and it has lots of grooves and regions. This half of Ganymede is lighter.
If we could live on Ganymede, it would be very cold. It would be so cold there would be over 10 ice skating rinks in each community. The snow would be shavings from ice and you would get a bump on the head if someone threw it at you. Jupiter's other moons could be other states and a shuttle bus (but this time it's a real shuttle) could take you there. You could slide or skate to school, so you wouldn't be exhausted getting there. There would be one hot tub in each community and everyone would fight to get into it. They'd have to pay too.
Vision by Sean
I got some of this information on this website: Ganymede site
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