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Kid's Space
"Windows to the Universe" provides planetary facts and activity pages (includes directions for making your own alien). Send a virtual postcard while you are visiting.
The Nine Planets
The Nine Planets is a multi-media tour of the solar system providing history, mythology, and scientific facts about the planets and moons in our solar system.
The Solar System
http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level2/solar_system.htm
Text and graphics combine to provide the basic facts about the sun, moon, meteoroids, planets, asteroids, and comets.
Astronomy Picture of the Day
http://antwrp.gsfc.nasa.gov/apod/astropix.html
Every day there is a new picture of outer space, accompanied by an (technical) explanation.