Planets, Dwarf Planets and Small Solar System Bodies

Questions and Answers By: International Astronomical Union Source:  http://www.iau.org/public/pluto/ Q: What is the origin of the word planet? A: The word planet comes from the Greek word for “wanderer”, meaning that planets were originally defined as objects that moved in the night sky with respect to the background of fixed stars. Q: Why is there a … Read more