The solar system's ten largest satellites are scattered between the gas giant planets - and Earth.

Feb 24, 2010 - Kelly Whitt

Here are a few activities to help kids learn about the scale of the Solar System, and the characteristics of individual planets and moons.

Jan 17, 2010 - Talia Sepersky

The solar system comes to your living room with all its wonders thanks to the 3D imagery brought to Blu-ray by the History Channel - perfect for homeschool.

Jan 13, 2011 - Christine Pollock

Volcanoes on Jupiter's moon, Io, are the largest in the Solar System. Current eruptions on Io would cause mass extinctions here on Earth.

Aug 24, 2010 - Alexandra Matiella Novak

There are numerous regions (or zones) of the Solar system. These include the inner solar system, the asteroid belt, the Jovian planets, and the Edgeworth-Kuiper belt.

Dec 24, 2008 - Scott Hermanson

Which solar system objects can you observe without binoculars or a telescope? Which are the brightest and which are the dimmest?

Mar 14, 2007 - Kelly Whitt

Geocentrism is an astronomical theory, central to the astronomy of Ancient Greece that posits that the Earth lies at the centre of the universe.

Feb 19, 2010 - Terry Long

Solar system planets, origin of the solar system, and additional facts about our solar system are presented here for a quick overview of the solar system.

Jun 16, 2010 - Rachel Schaus

On the outer part of the Solar System lie some big and fabulous worlds. These are very different from the interior planets where the rocky Earth resides.

Jul 24, 2009 - Anna Sanclement

Heliocentrism is an astronomical theory that posits that sun is at the centre of the Solar System.

Mar 4, 2010 - Terry Long

Earth has very active plate tectonics shaping its geology and features. Other planets and moons in the solar system have varying degrees of tectonic activity.

Feb 23, 2009 - Paul A. Heckert

Here are some facts to help you out when teaching or learning about the planets in our solar system. There may even be a 10th planet coming soon!

Jul 8, 2007 - Denise Oliveri

Learn the eight planets, their order from the sun, as well as basic info about the planets. Find out other interesting facts about the solar system.

Apr 29, 2010 - Rachel Schaus

Brian Cox (not that one) tells an interesting yet down to Earth story of how a collection of gases in the atmosphere are important in the development of a planet.

Mar 23, 2010 - Steven Cookson

With the demotion of Pluto from planetary status, we can now properly classify all the bodies in the solar system

Apr 9, 2011 - Jon Plotkin

If our solar system had developed into a double star, Jupiter would have been the sun's companion star. Instead, it is the protector of the inner planets.

Apr 11, 2011 - Jon Plotkin

This activity will help students learn and understand the mechanics behind Moon phases and solar and lunar eclipses.

Feb 1, 2010 - Talia Sepersky

Everyone needs a goal while exercising: make visiting all the planets yours!

May 18, 2010 - John Kulczycki

Pluto, by author Barrie Jones, is an interesting and intriguing story of Pluto, our solar system and the universe. Pluto's tale is well-told and presented.

May 8, 2011 - Donald Reinhardt