Shop Windows to the Universe

The Universe at Your Fingertips 2.0 DVD from the Astronomical Society of the Pacific is in our online store, filled with Earth and space science resources.
This is an artist's conception of the magnetosphere of Ganymede.
Click on image for full size
Windows Original

Magnetosphere of Ganymede

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!

Last modified September 19, 2003 by Jennifer Bergman.

Shop Windows to the Universe Science Store!

Learn about Earth and space science, and have fun while doing it! The games section of our online store includes a climate change card game and the Traveling Nitrogen game!

Windows to the Universe Community

News

Opportunities

You might also be interested in:

Cool It! Game

Check out our online store - minerals, fossils, books, activities, jewelry, and household items!...more

The Earth as a Magnet

The Earth has a magnetic field with north and south poles. The magnetic field of the Earth is surrounded by the magnetosphere. The magnetosphere keeps most of the particles from the sun, carried in solar...more

Galileo

Galileo was a spacecraft that orbited Jupiter for eight years. It made many discoveries about Jupiter and its moons. Galileo was launched in 1989, and reached Jupiter in 1995. The spacecraft had two parts....more

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),...more

Galileo Reaches the End of its Road

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

Space Weather throughout the Solar System

The Sun is huge. It has an effect on things even if they are far from the Sun. The "bubble" where the Sun has an effect on things is called the heliosphere. It goes even past Pluto! The place...more

Amalthea

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

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

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF