This is a cutaway of Ganymede's interior.
Click on image for full size
Interior of Ganymede
The picture on this page shows what the inside of Ganymede looks like. Scientists have made this model based on measurements by the Galileo spacecraft. The picture shows a samll core of metal (silver), then some rocky material (brown), then some ice (blue).
Using Galileo, scientists also found that Ganymede has a strong magnetic field - the first time this was ever measured near any moon!
Shop Windows to the Universe Science Store!
Our online store
on science education, ranging from evolution
, classroom research
, and the need for science and math literacy
You might also be interested in:
Minerals are the building blocks of rocks. There are many different types of minerals. All of them are solid and all are made of atoms of elements. Minerals can grow even though they are not alive. Most...more
Did you know that some of the planets and moons can be magnetic? Earth is! The Galileo spacecraft found out that a moon of Jupiter, Ganymede, is magnetic too! ...more
You may wonder how it is that scientists know what the inside of a planet is like. The way the mass of a body is spread inside the body affects how the body spins in space. If the body has a large core,...more
There has been no icy volcanism on Ganymede, nor continental drift, but it does seem that there have been movements of the surface. Examination of the surface of Ganymede reveals many kinds of faulting....more
Galileo is a spacecraft that has been orbiting Jupiter for eight years. On September 21, 2003, Galileo will crash into Jupiter. It will burn up in Jupiter's atmosphere. The crash is not an accident! The...more
Amalthea was discovered by E Barnard in 1872. Of the 17 moons it is the 3rd closest to Jupiter. Amalthea is about the size of a county or small state. Amalthea is named after the goat in Greek mythology...more
Callisto was first discovered by Galileo in 1610. It is the 2nd largest moon in the solar system, and is larger than the Earth's moon. It is about as big as the distance across the United States. Callisto...more