Journey Into Space: Gravity, Orbits, and Collisions
Space Astronomy and Space
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Is an Asteroid Heading for Earth?

Investigate the solar systems secrets.

Throughout our solar system, asteroids and comets are orbiting the Sun. Some, called Near-Earth-Objects (or NEOs), have orbits that bring them close to Earth. Discover more about NEOs at the NASA site, Asteroid and Comet Impact Hazards:

http://impact.arc.nasa.gov/.

You can also learn about the Torino Scale, which measures the potential damage from objects striking Earth.
   
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