When you are in the city, only a few of the brightest stars are visible. But when you are in the country, you can see many more stars than you can count. Sometimes you can even see the bright belt of our galaxy, the Milky Way. In this...

In ancient times only five planets were known: Mercury, Venus, Mars, Jupiter, and Saturn. Learn about Greek astronomer Ptolemy's theory for the solar system that was to survive for fourteen centuries.

Earth's atmosphere, the ocean of air that blankets the planet, is mostly nitrogen and oxygen, with small amounts of other gases. How much oxygen is present in air at sea level? Is air high up in the Appalachians or Rockies? Atop Mount...

On a rainy day, do you ever wonder what the weather is like on the other side of the planet? Different regions around the globe can have very different seasonal weather patterns. In this experiment, you can test if these seasonal...

This site is astronomy for kids and teachers! Here students can learn about the planet Earth of the Solar System including fun facts, mass, day, year, and distance from the Sun.

Kids learn about the planet Venus of the Solar System including fun facts, mass, day, year, and distance from the Sun. Astronomy for kids and teachers.

Created to teach students of the 21st century, SOPHIA is bringing Mars straight to your fingertips. Discover what scientific discoveries are occurring in the rest of the universe with this interactive tutorial.

Test your knowledge about the solar system with games and activities designed to help explore what you know about the sun, the planets and their moons, space rocks, the Milky Way, and related topics.

This activity is designed to accompany an interactive on the Annenberg Learner website. Students investigate the changes that take place in an ecosystem when they alter the organisms in a food web. As they work with the simulation, they...

Learn about the lives of stars, and how stars and planets form. The Interactive activity, 'Planet Families' requires Adobe Flash and cannot be launched.

This article answers some of the most common questions about Mars: Why is it red? Is there water on Mars? What else have scientists discovered from spacecraft that have landed there? Also, visitors can follow links to learn more about...

Kids learn about the ice giant planet Uranus of the Solar System including fun facts, mass, day, year, and distance from the Sun. Astronomy for kids and teachers.

Everything on our planet is linked by a giant recycling system called the biogeochemical cycle. How our planet recycles and reuses everything we need to support life is explained by making a miniature biosphere in this lab. You will also...

Our home, Earth, is a living planet. Earthquakes and volcanic eruptions are proof that the geological forces that shaped our planet and created the land masses are ongoing. An amazing example of geologic activity that is less damaging is...

Did you know that ancient astronomers could measure the distance to other stars? They could also distinguish between stars and planets. How could they do that without modern technology of telescopes? See if you can discover the link...

How do astronomers collect stardust? They design and build satellites that are launched into space to collect particles on specially designed panels. Satellites can be sent to orbit around an object of interest: a planet, moon, or comet....

Find lesson plans, worksheets, photo galleries, and related links for teaching about the weather systems of planets in our solar system.

Material to begin an exploration of the Solar System: the characteristics of the planets, theories about planet formation, and more. An hour-long video is accompanied by learning goals, an outline and overview, details on star formation,...

There are battles that are fought each day on the planet. The invading forces are those of viruses and bacteria. Left alone they would take over and destroy every cell! It is up to some key defense systems to battle and destroy these...

What makes up the Solar System? Kid astronomers learn about the planets and the sun.

Did you know you can see many satellites with the naked eye? Try this activity and find out for yourself!

How do you recognize life on another planet? What tests do scientists use to determine if something is a life form when they are many light years away from being able to observe it directly? Try your hand at interactives to create a...

Quaoar, the most recent addition to our solar system, has displayed many planet-like characteristics but has yet to be named "the 10th planet." Learn more about the interesting find here. Many links to various sites on Quaoar and the...

How much would you weigh on Mars? Learn this information and other cool facts about the red planet, Mars.