In 2006 the International Astronomical Union officially defined the wordplanet classifying Pluto as a dwarf planet. All text and diagrams in these uptodate book... » 

In 2006 the International Astronomical Union officially defined the wordplanet classifying Pluto as a dwarf planet. All text and diagrams in these uptodate books reflect the change clearly and accessibly for your youngestreaders. The Pluto title explains what a dwarf planet is. Stay current withthese revised editions «