jueves, 23 de septiembre de 2010

The Inner Solar System

  1. Planet: a large body orbiting a star, such as the sun.
  2. solar system: a star, such as the Sun, and all the objects orbiting it.
  3. asteroid: a rocky, metallic object that orbits the sun.
  4. Kepler's laws: laws that summarize the movement of the planets.

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