The Facts:

*is known as the seventh and largest of Jupiter's known satellites; also the 3rd of Galilean moons

 *Ganymede in Greece was meant to be a Trojan boy of great beauty whom Zeus carried away to be a cup bearer to the gods.

 *in 1610, Ganymede was discovered by Galileo and Marius.

       Known As:

 Known as the largest satellite in the solar system. Ganymede is larger then mercury but only half it's mass. Larger than Pluto.

 The surface of Ganymede is make of rough mixtures.

 Ganymede,  Jupiter's largest moon. It was named after the mythological character.

 Ganymede is the only satellite in the Solar System known to possess a magnetosphere.

   The Moon:

 As you can see, Ganymede is one of the many moons of Jupiter.

  Ganymede completes its orbit around Jupiter in about seven Earth days.

   Life on Ganymede:

Life on Ganymede would not exist.

There are some plants on Ganymede. The Coral Reef lives on Ganymede.

There is heat on Ganymede.

Life doesn't get a start unless environmental factors are favorable. 

 Pictures:

This is a picture of Ganymede; Jupiter's moon in color

This is Ganymede showing how small it is compared to Jupiter.

Ganymede is larger than Mercury

Ganymede once again

A comparison of Ganymede, the Earth, and the Earth's moon.