Solar System
Sizing up the Universe - game
Time Zone X: Galileo - game
Build a Solar System game
Fly to Mars game
What if an asteroid hit my town?
Disk Detective - identify birth place of planets
Planet Four - classify features on Mars
Are We Alone? The Drake Equation will give you an answer
Astro-Venture Search for and design a habitable planet
Exoplanets NASA's current planet count
Aliens in the Milky Way? Cast your vote, then see some counter arguments
Stars and Galaxies
Galileo's Sunspot Drawings - The rotation of the sun
Sun Lab from Nova
Fusion - Minute Labs
National Solar Observatory - Current images of the sun at many wavelengths
Solar Storm Watch - spot solar storms
Star in a Box - investigate the life cycles of stars
Constellations - story behind their names
Doppler Shift of Spectral Lines
Erupting Black Holes - search for black holes
NASA Kids' Club - Space Games
Galaxy Zoo - classify galaxies
Milky Way Project - classify objects
The Space Place - NASA site, games and more
Astronomy Simulations and Animations - Using Flash, run the .swf link