The following Websites are copied from a very useful Astronomy textbook " Explorations: an introduction to astronomy" by Thomas T. Arny:

  Explorations: An introduction to astronomy by Thomas T. Arny:  www.mhhe.com/arny

  Yahoo: www.yahoo.com/Science/Astronomy/

   The planet Earth: http://seds.lpl.arizona.edu/nineplanets/nineplanets/earth.html

Views of The Solar Systems:  http://www.solarviews.com/eng/homepage.htm

Students for the Exploration and Development of Space:  www.seds.org

  Astronomy Picture of The Day:  http://antwrp.gsfc.nasa.gov/apod/archivepix.html

  Astronomy and Space:  http://fourmilab.ch/nav/topics/astrospace.html

   A Multimedia Tour of the Solar System: http://www.nineplanets.org/

  Simple and Brief Introduction to Astronomy: http://www.qsl.net/ei5fk/intro.htm