Jupiter's Largest Moon
JUPITER'S LARGEST MOON GANYMEDE
Ganymede was discovered by Galileo Galilei on June 7th 1610. Ganymede is Jupiter's largest moon. It is larger than Mercury and Pluto, but slightly smaller than Mars. It could be mistaken as a planet itself. Ganymede is Jupiter's seventh moon. Due to its size a human can see it with his/her bare eye. The temperature of Ganymede is so cold humans would freeze as soon as they touched this moon. It is -171F to -197F in daytime and -193C at nighttime. When Ganymede was first discovered by Galileo he called it Jupiter III. But in the mid 1800's Jupiter III's name was discontinued and was then called Ganymede. Ganymede has a core of metallic iron, which is followed by a layer of rock topped off with a crust of ice that is very thick, and ruff surfaces on the outsides. It is believed that there is a salty lake of water 124 miles under Ganymede's surface.
The Gentle Giants of Ganymede
By: James P.