Defining 'Planets'

The International Astronomical Union yesterday downgraded Pluto to a new category called "dwarf planet," leaving only eight "classical planets" in the solar system. The organization also created a subcategory of dwarf planets - "trans-Neptunian objects" - to which Pluto belongs. It did not settle on an official name for the category.

Defining 'Planets'

Network News

X Profile
View More Activity
© 2006 The Washington Post