Topic: Eris (Dwarf Planet)
Long considered a planet, Pluto was reclassified as a 'dwarf planet' in 2006 by the International Astronomical Union. Will the discovery of a fifth moon prompt astronomers to reconsider?
Cal Tech astronomer and author Mike Brown helped to demote Pluto from planethood – and got a lot of hate mail as a result.
12/17/2010 11:52 am
New calculations indicate that Pluto might be the largest object in the outer solar system. Does it now deserve to be called a planet again?
11/22/2010 05:52 pm
Ceres and Pluto will come into opposition with the sun, offering a rare view of these two dwarf planets.
06/17/2010 01:40 pm