NASA logo links to Near-Earth Objects Quiz
Follow this link to skip to the main contentdiagram showing planets and a Near-Earth object  
  3. Near-Earth asteroids are asteroids that have been nudged by the gravitational attraction of nearby planets into orbits that allow them to enter Earth's neighborhood. About how many Near-Earth asteroids have been found?
  A About 3 or 4
  B 900
  C more than 4,300
  D 2.3 trillion
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Near-Earth Objects Quiz
  Jet Propulsion Laboratory
   California Institute of Technology
  + Near Earth Object Program