Since 2005
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3D, realtime solar system simulator. Creates a display of planets, moons, stars, galaxies, asteroids, and spacecraft.
http://www.openuniverse.org/
includes links to current news articles, a description of each planet's prominent features, and a gallery of orginal art.
http://www.solarvoyager.com/
solar system learning guide for people of all ages.
http://www.solarviews.com/