Amazing Space [ Kids/Teens/Mature Teens ] - Collection of web-based activities designed for classroom use, but made available for everyone to enjoy. http://amazing-space.stsci.edu/

Arty the Part Time Astronaut [ Kids ] - An interactive adventure for young astronomers guiding Arty and his alien friend Greg through our solar system. http://www.artyastro.com/

Build a Newtonian Physics Machine [ Kids/Teens ] - If you build it carefully, this Newtonian Physics Machine device demonstrates one of the basic laws of nature. http://spaceplace.jpl.nasa.gov/en/kids/funphysics.shtml

Building an Inexpensive Galilean Style Telescope [ Mature Teens ] - Students at Rice University explain how they re-created the telescope that Galileo used to make the first ever magnified views of the stars and planets... and all for less than 30 dollars. http://galileo.rice.edu/lib/student_work/astronomy95/telescope_design.html

Cassini Kid's Page [ Teens ] - Spacecraft Cassini is on its way to Saturn. Download the parts and instructions to build a paper model of the Cassini space probe. Find Saturn in the sky and discover more about this exciting adventure in space. http://saturn.jpl.nasa.gov/kids/

Eyes on the Sky, Feet on the Ground [ Kids ] - This collection of children's online astronomy activities, is a product of the Smithsonian Astrophysical Observatory. Designed for grades 2 to 6, it contains hundreds of fun explorations into astronomy as a classroom tool for learning how to theorize, experiment, and analyze data. http://hea-www.harvard.edu/ECT/the_book/index.html

Mars: Just For Kids [ Kids ] - An official NASA site with games and activities for kids interested in interplanetary travel - especially to Mars. http://mars.jpl.nasa.gov/kids/

NASA for Kids [ Kids ] - Has games, stories and activities about space and aeronautics. http://www.nasa.gov/audience/forkids/home/

NASA Qwhiz [ Teens ] - Qwhiz is a real-time, multi-player web game for kids and teachers. Read some material on the Internet, then answer questions about it. http://prime.jsc.nasa.gov/Qwhiz/

Powers of 10 [ Teens/Mature Teens ] - Discover the relative size of everything in the universe. Beginning with a 1 metre square, each successive page jumps back 10 times until you are a billion light years away. Lots of good activities and information. Based on the Eames film of the same name. http://www.powersof10.com/

Project Starshine [ Kids/Teens/Mature Teens ] - Your school can help to build a satellite which will be launched from the Space Shuttle. You can track the Starshine satellites from your back yard. http://www.azinet.com/starshine

Satellite Tracking and Prediction [ Teens/Mature Teens ] - See the space station, the space shuttle and many other satellites from your back yard. http://www.heavens-above.com/

Scale in the Solar System [ Teens ] - Instructions and teacher guides for making scale models of the Solar System, Saturn, and comets. http://cosmos.colorado.edu/~urquhart/Scale/

Sea and Sky: Travelport Entrance [ Kids/Teens/Mature Teens ] - Fun and informative site for kids of all ages. Games, resources, galleries, and latest developments in exploration of sea and sky. Lots of great graphics. http://www.seasky.org/mainmenu.html

Space Experiment Module (SEM) [ Kids/Teens/Mature Teens ] - Make discoveries about space through experiments kids can do at home. By NASA. http://sspp.gsfc.nasa.gov/sem/about.html

StarChild: A Learning Center for Young Astronomers [ Kids ] - Offers an interactive gaming and entertainment center for kids who wish to learn more about the solar system, the universe, and space. http://starchild.gsfc.nasa.gov/docs/StarChild/StarChild.html

Understanding the Universe - Discovery Channel School [ Kids/Teens ] - Discover the incredible size and history of the universe through interactive gaming. Learn about important people who taught us about space, and tour some distant galaxies. http://school.discovery.com/schooladventures/universe/

Walk the Solar System [ Teens ] - JavaScript calculator of sizes and distances of solar system bodies for making a scale model. http://www.exploratorium.edu/ronh/solar_system/

Who's Out There? Searching for Extraterrestrial Intelligence [ Kids/Teens/Mature Teens ] - Game that explores tools and knowledge required to design a research project to search for extraterrestrial intelligence, then tests your skills at searching for alien signals. http://www.kintera.org/site/pp.asp?c=foJTIYOwEoH&b=186082