Archives for 4 February 2009
Defining Planets (Part II)
Published on 4 Feb 2009 at 11:43 am.
7 Comments.
Filed under planets.
In my last post, I gave a sort of history of how we got to having 9 planets in the Solar System, according to science textbooks for most of the Twentieth Century. But, Pluto was a problem from the very beginning.
Already, by the beginning of the Twentieth Century, astronomers knew that there was a […]
