References

  1. The Essential Cosmic Perspective, fourth ed. 2008
  2. Essentials of Astronomy, Motz & Duveen, second print. 1967
  3. Sky and Telescope, April 2011
  4. Sky and Telescope, July 2010
  5. Design & Origins in Astronomy, George Mulfinger, 3rd print. 1996
  6. Sky and Telescope, June 1999
  7. Sky and Telescope, April 2003
  8. Sky and Telescope, August 2010
  9. Galaxy, Exploring the Milky Way, Stuart Clark, Fall River Press, 2008 ed.
  10. Sky and Telescope, May 2011
  11. Starlight and Time, Russell Humphreys, 6th print. 2000
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