15. Solar System Exploration: Bodies: Asteroids
    Asteroids are rocky fragments left over from the formation of the solar system about 4.5 billion years ago.
    http: //solarsystem.nasa.gov/features/planets/aster...
    
    
16. StarDate Online
    Astronomers have discovered thousands of asteroids in our solar system, and millions more probably await discovery...
    http: //stardate.org/resources/ssguide/asteroids.ht...
    
    
17. explorezone.com: Explore the Science of Asteroids
    Explore Asteroids: Animations and reference about the science of asteroids. Any questions?
    http: //explorezone.com/space/asteroids.htm
    
    

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